project: Be explicit about project-searchability for buffers (#37773)

Closes https://github.com/zed-industries/zed/issues/28830

Release Notes:

- Fixed builtin buffers and log views showing up in project search

crates/auto_update_ui/src/auto_update_ui.rs

@@ -88,10 +88,7 @@ fn view_release_notes_locally(
                         .update_in(cx, |workspace, window, cx| {
                             let project = workspace.project().clone();
                             let buffer = project.update(cx, |project, cx| {
-                                let buffer = project.create_local_buffer("", markdown, cx);
-                                project
-                                    .mark_buffer_as_non_searchable(buffer.read(cx).remote_id(), cx);
-                                buffer
+                                project.create_local_buffer("", markdown, false, cx)
                             });
                             buffer.update(cx, |buffer, cx| {
                                 buffer.edit([(0..0, body.release_notes)], None, cx)