fix(ci): Add Package.swift to benchmarking and unit test file filters (#6780)

- Add Package*.swift to run_benchmarking_for_prs filter
  Benchmarking builds iOS-Swift app, and xcodebuild resolves SPM
  dependencies for all projects in the workspace, so Package.swift
  changes can affect benchmarking builds.

- Add Package*.swift to run_unit_tests_for_prs filter
  The distribution-tests job in test.yml directly uses Package.swift
  via prepare-package.sh, so it should be included in the filter.

Author: philprime

.github/file-filters.yml

@@ -132,6 +132,7 @@ run_benchmarking_for_prs: &run_benchmarking_for_prs
   - "Samples/iOS-Swift/iOS-Swift.xcconfig"
   - "Samples/iOS-Swift/iOS-SwiftClip.xcconfig"
   - "Samples/iOS-Swift/iOS-Benchmarking.xcconfig"
+  - "Package*.swift"
 
   # Build configuration
   - "fastlane/**"