"excluded" parameter handling changed in 0.43.0

New Issue Checklist

• Updated SwiftLint to the latest version
• I searched for existing GitHub issues

Describe the bug

We have this exclusion in .swiftlint.yml and it was working in 0.42.0 but after upgrading to 0.43.0, code inside that directory is producing warnings.

excluded:
  - Utils/3rdParty

Changing this to either path/from/git/root/Utils/3rdParty solves the issue.

Complete output when running SwiftLint, including the stack trace and command used

we have this script in our Xcode build phases:

ROOT_DIR="$(git rev-parse --show-toplevel)"
# using default lint rules if not overridden for the project
ln -s "$ROOT_DIR/.swiftlint.yml" "$SRCROOT/.swiftlint.yml"
"$($BREW --prefix)/bin/swiftlint" --path "$SRCROOT"

Environment

• SwiftLint version (run swiftlint version to be sure)?
  • 0.43.0
• Installation method used (Homebrew, CocoaPods, building from source, etc)?
  • Homebrew
• Paste your configuration file:

excluded:
  - Utils/3rdParty

• Are you using nested configurations?
  If so, paste their relative paths and respective contents.
  • No
• Which Xcode version are you using (check xcodebuild -version)?
  • 12.4
• Do you have a sample that shows the issue? Run echo "[string here]" | swiftlint lint --no-cache --use-stdin --enable-all-rules
  to quickly test if your example is really demonstrating the issue. If your example is more
  complex, you can use swiftlint lint --path [file here] --no-cache --enable-all-rules.
  • No

Edit: This is on an M1 MacBook, don't know if that matters.

Reproduce the regression with the .swiftlint.yml exclusion and the Xcode build-phase command using --path "$SRCROOT". Trace how relative excluded paths are interpreted between versions, then add a regression test for Utils/3rdParty; done means the relative exclusion works again in 0.43.0 without requiring the repository-root prefix.