Protected packages: Adding finder for PackageProtectionRule [Follow-up]

Summary

The following discussion from !124776 (merged) should be addressed, see discussion.

Currently, the evaluation of package protection rules is done in the class PackagePolicy. This could be refactored because: =

• Logic for matching package protection rules cannot be reused by other components
• Complexity PackagePolicy is unnecessarily high

Related to Protected packages: Add basic model and migrati... (#416382)

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Improvements

When extracting this in a dedicated finder service class, e.g. PackageProtectionRuleFinder, PackageProtectionRuleEvaluator, etc.

Risks

• This refactoring will involve the evaluation of the package protection rules.
• Existing test for PackagePolicy will not be changed and ensure expected behavior
• New tests will be added for respective finder service class

Involved components

• Packages::PackagePolicy

Optional: Intended side effects

Optional: Missing test coverage