feat: matchFiles

[rarkins]

Changes:

Adds matchFiles to packageRules.

Context:

The current "substring" support in matchPaths is too flexible for some situations and doing simple rules like match package.json but not packages/backend/package.json is too hard. matchFiles is exact match only.

I've chosen matchFiles instead of matchPackageFiles in case we find a use for matching against a lock file later.

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please tick one)

I have verified these changes via:

• Code inspection only, or
• Newly added unit tests, or
• No new tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[renovate-release]

🎉 This PR is included in version 24.56.0 🎉

The release is available on:

• GitHub release
• 24.56.0

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