Fix lock file check regression for in-process watchers

[myovchev]

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Summary

The lock file dependency check that forces a full rebuild now runs once per process. Watcher-triggered rebuilds stay scoped to the detected changes instead of rebuilding everything on every file change when the lock file changed or is absent. This bug was in effect only for projects missing a lock file in their npmRoot (e.g. npm monorepos).

What are the specific steps to test this change?

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File change on projects not having a lock file in their npmRoot doesn't trigger full rebuild.

What kind of change does this PR introduce?

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• Bug fix
• New feature
• Refactor
• Documentation
• Build-related changes
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• It includes a) the existing issue ID being resolved, b) a convincing reason for adding this feature, or c) a clear description of the bug it resolves
• The changelog is updated
• Related documentation has been updated
• Related tests have been updated

If adding a new feature without an already open issue, it's best to open a feature request issue first and wait for approval before working on it.

Other information:

[linear]

PRO-9688