Fix default compile package detection in PNPM repos

[askoufis]

Using withSymlinks always resolves to an absolute path. However, in combination with withRelativePaths, fdir thinks it's dealing with a relative path, but it's actually absolute, so it ends up removing part of the start of the path, resulting in an error.

In hindsight, it's much simpler to just use absolute paths everywhere, rather than joining paths ourselves.

Not exactly sure how this slipped through when I was testing the fdir refactor, but I don't think the effort required to setup a unit test for this functionality is worth it.

[changeset-bot[bot]]

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Latest commit: fb022a68c79f32aa22f939d36813fe0b170b7cdc

The changes in this PR will be included in the next version bump.

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