Fix cargo shear warnings (#64340)

Also updates CI to always run this - that way we ensure that disabling
or enabling tests does not become stale at some point and thus can
safely add this.

Release Notes:

- N/A
- [GPUI] N/A

.github/workflows/autofix_pr.yml

@@ -61,7 +61,7 @@ jobs:
       run: cargo fix --workspace --allow-dirty --allow-staged
     - name: autofix_pr::run_autofix::run_cargo_shear_fix
       if: inputs.run_clippy == true || inputs.run_clippy == 'true'
-      run: cargo shear --fix
+      run: cargo shear --fix --check-test-targets
     - name: autofix_pr::run_autofix::run_clippy_fix
       if: inputs.run_clippy == true || inputs.run_clippy == 'true'
       run: cargo clippy --workspace --fix --allow-dirty --allow-staged

.github/workflows/run_tests.yml

@@ -707,7 +707,7 @@ jobs:
       with:
         tool: cargo-shear@1.13.4
     - name: run_tests::check_dependencies::run_cargo_shear
-      run: cargo shear --locked --deny-warnings
+      run: cargo shear --locked --deny-warnings --check-test-targets
     - name: run_tests::check_dependencies::check_cargo_lock
       run: cargo update --locked --workspace
     - name: run_tests::check_dependencies::check_crate_graph