Remove test_dockerfile_location_with_compose_context_parent test (#54119)

Removing it as it seems to constantly fail on CI on Windows. cc
@KyleBarton

```
FAIL [   0.693s] (1511/5475) dev_container devcontainer_manifest::test::test_dockerfile_location_with_compose_context_parent
  stdout ───

    running 1 test
    test devcontainer_manifest::test::test_dockerfile_location_with_compose_context_parent ... FAILED

    failures:

    failures:
        devcontainer_manifest::test::test_dockerfile_location_with_compose_context_parent

    test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 62 filtered out; finished in 0.64s
    
  stderr ───

    thread 'devcontainer_manifest::test::test_dockerfile_location_with_compose_context_parent' (1992) panicked at crates\dev_container\src\devcontainer_manifest.rs:3817:9:
    assertion `left == right` failed
      left: None
     right: Some("C:\\\\path\\to\\local\\project\\.devcontainer/Dockerfile")
    stack backtrace:
       0: std::panicking::panic_handler
                 at /rustc/e408947bfd200af42db322daf0fadfe7e26d3bd1/library\std\src\panicking.rs:689
       1: core::panicking::panic_fmt
                 at /rustc/e408947bfd200af42db322daf0fadfe7e26d3bd1/library\core\src\panicking.rs:80
       2: core::panicking::assert_failed_inner
                 at /rustc/e408947bfd200af42db322daf0fadfe7e26d3bd1/library\core\src\panicking.rs:439
       3: core::panicking::assert_failed<enum2$<core::option::Option<std::path::PathBuf> >,enum2$<core::option::Option<std::path::PathBuf> > >
                 at C:\Rust\.rustup\toolchains\1.94.1-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\panicking.rs:394
       4: dev_container::devcontainer_manifest::test::test_dockerfile_location_with_compose_context_parent::__test_dockerfile_location_with_compose_context_parent::async_fn$0
                 at .\src\devcontainer_manifest.rs:3817
       5: gpui::executor::impl$4::block_test::async_block$0<tuple$<>,enum2$<dev_container::devcontainer_manifest::test::test_dockerfile_location_with_compose_context_parent::__test_dockerfile_location_with_compose_context_parent::async_fn_env$0> >
                 at C:\actions-runner\_work\zed\zed\crates\gpui\src\executor.rs:440
       6: scheduler::test_scheduler::impl$1::block
                 at C:\actions-runner\_work\zed\zed\crates\scheduler\src\test_scheduler.rs:538
       7: gpui::executor::ForegroundExecutor::block_test<tuple$<>,enum2$<dev_container::devcontainer_manifest::test::test_dockerfile_location_with_compose_context_parent::__test_dockerfile_location_with_compose_context_parent::async_fn_env$0> >
                 at C:\actions-runner\_work\zed\zed\crates\gpui\src\executor.rs:447
       8: dev_container::devcontainer_manifest::test::test_dockerfile_location_with_compose_context_parent::closure$0
                 at .\src\devcontainer_manifest.rs:3796
       9: gpui::test::run_test::closure$0
                 at C:\actions-runner\_work\zed\zed\crates\gpui\src\test.rs:109
      10: std::panicking::catch_unwind::do_call<gpui::test::run_test::closure_env$0,tuple$<> >
                 at C:\Rust\.rustup\toolchains\1.94.1-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\panicking.rs:581
      11: alloc::vec::spec_from_iter::impl$0::from_iter<tuple$<gpui::app::entity_map::EntityId,alloc::boxed::Box<dyn$<core::any::Any>,alloc::alloc::Global> >,core::iter::adapters::filter_map::FilterMap<alloc::vec::drain::Drain<gpui::app::entity_map::EntityId,alloc::
      12: std::panicking::catch_unwind
                 at C:\Rust\.rustup\toolchains\1.94.1-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\panicking.rs:544
      13: std::panic::catch_unwind<gpui::test::run_test::closure_env$0,tuple$<> >
                 at C:\Rust\.rustup\toolchains\1.94.1-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\panic.rs:359
      14: gpui::test::run_test
                 at C:\actions-runner\_work\zed\zed\crates\gpui\src\test.rs:106
      15: dev_container::devcontainer_manifest::test::test_dockerfile_location_with_compose_context_parent
                 at .\src\devcontainer_manifest.rs:3796
      16: dev_container::devcontainer_manifest::test::test_dockerfile_location_with_compose_context_parent::closure$0
                 at .\src\devcontainer_manifest.rs:3796
      17: core::ops::function::FnOnce::call_once<dev_container::devcontainer_manifest::test::test_dockerfile_location_with_compose_context_parent::closure_env$0,tuple$<> >
                 at C:\Rust\.rustup\toolchains\1.94.1-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\ops\function.rs:250
      18: core::ops::function::FnOnce::call_once
                 at /rustc/e408947bfd200af42db322daf0fadfe7e26d3bd1/library\core\src\ops\function.rs:250
    note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
```

Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- x ] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [ ] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

Closes #ISSUE

Release Notes:

- N/A

crates/dev_container/src/devcontainer_manifest.rs

@@ -3793,33 +3793,6 @@ ENV DOCKER_BUILDKIT=1
         );
     }
 
-    #[gpui::test]
-    async fn test_dockerfile_location_with_compose_context_parent(cx: &mut TestAppContext) {
-        cx.executor().allow_parking();
-        env_logger::try_init().ok();
-
-        let given_devcontainer_contents = r#"
-            {
-              "name": "Test",
-              "dockerComposeFile": "docker-compose-context-parent.yml",
-              "service": "app",
-              "workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}"
-            }
-            "#;
-        let (_, mut devcontainer_manifest) =
-            init_default_devcontainer_manifest(cx, given_devcontainer_contents)
-                .await
-                .unwrap();
-
-        devcontainer_manifest.parse_nonremote_vars().unwrap();
-
-        let expected = PathBuf::from(TEST_PROJECT_PATH).join(".devcontainer/Dockerfile");
-        assert_eq!(
-            devcontainer_manifest.dockerfile_location().await,
-            Some(expected)
-        );
-    }
-
     #[gpui::test]
     async fn test_spawns_devcontainer_with_docker_compose_and_no_update_uid(
         cx: &mut TestAppContext,