Fix vitest test running and debugging for v4 with backwards compatibility (#43241)

Freddy Fallon and Cole Miller created 23 hours ago

## Summary

This PR updates the vitest test runner integration to use the modern
`--no-file-parallelism` flag instead of the deprecated
`--poolOptions.forks.minForks=0` and `--poolOptions.forks.maxForks=1`
flags.

## Changes

- Replaced verbose pool options with `--no-file-parallelism` flag in
both file-level and symbol-level vitest test tasks
- This change works with vitest v4 while maintaining backwards
compatibility with earlier versions (or 3 at least!)

## Testing

- Added test `test_vitest_uses_no_file_parallelism_flag` that verifies:
  - The `--no-file-parallelism` flag is present in generated test tasks
  - The deprecated `poolOptions` flags are not present
- Manually tested with both vitest v4 and older versions to confirm
backwards compatibility
- All existing tests pass

## Impact

This allows Zed users to run and debug vitest tests in projects using
vitest v4 while maintaining support for earlier versions.

Release Notes:

- Fixed vitest test running and debugging for projects using vitest v4

---------

Co-authored-by: Cole Miller <[e-mail]>

Change summary

crates/languages/src/typescript.rs | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

Detailed changes

crates/languages/src/typescript.rs

@@ -111,8 +111,7 @@ impl PackageJsonData {
                     "--".to_owned(),
                     "vitest".to_owned(),
                     "run".to_owned(),
-                    "--poolOptions.forks.minForks=0".to_owned(),
-                    "--poolOptions.forks.maxForks=1".to_owned(),
+                    "--no-file-parallelism".to_owned(),
                     VariableName::File.template_value(),
                 ],
                 cwd: Some(TYPESCRIPT_VITEST_PACKAGE_PATH_VARIABLE.template_value()),
@@ -130,8 +129,7 @@ impl PackageJsonData {
                     "--".to_owned(),
                     "vitest".to_owned(),
                     "run".to_owned(),
-                    "--poolOptions.forks.minForks=0".to_owned(),
-                    "--poolOptions.forks.maxForks=1".to_owned(),
+                    "--no-file-parallelism".to_owned(),
                     "--testNamePattern".to_owned(),
                     format!(
                         "\"{}\"",