Fix package manager detection in non-monorepos

[askoufis]

For reasons unknown, @manypkg/find-root only returns a tool (package manager) if it detects that you're in a monorepo. If you're not, it returns a Root tool, which is absolutely useless.

This was causing yarn (via the fallback logic) to be incorrectly detected as the package manager in a pnpm repo, causing sku pre-commit to run the wrong command (yarn --check-files).

I've kept the root directory detection from @manypkg/find-root, but leveraged @antfu/ni's API for detecting the package manager in the case where a non-supported tool is detected. This involves looking for lockfiles, which is what the detect API from @antfu/ni does, but it's async only, so I've made a synchronous version because package manager detection in sku can't be made async right now.

Finally, I made the lintStaged call use config defined as an object rather than resolving to a file because it's simpler IMO. I did this initially as I thought maybe the lint staged config was the issue.

[changeset-bot]

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Latest commit: 8b88a6d

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

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sku	Patch

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