Issue #3274323 by phenaproxima: Split ExcludedPathsSubscriber into multiple classes

package_manager/package_manager.services.yml

package_manager/src/Event/ExcludedPathsTrait.php

...e_manager/src/EventSubscriber/ExcludedPathsSubscriber.php

package_manager/src/PathExcluder/GitExcluder.php

package_manager/src/PathExcluder/PathExclusionsTrait.php

...ge_manager/src/PathExcluder/SiteConfigurationExcluder.php

package_manager/src/PathExcluder/SiteFilesExcluder.php

package_manager/src/PathExcluder/SqliteDatabaseExcluder.php

package_manager/src/PathExcluder/TestSiteExcluder.php

package_manager/src/PathExcluder/VendorHardeningExcluder.php

...manager/tests/src/Kernel/PathExcluder/GitExcluderTest.php

...src/Kernel/PathExcluder/SiteConfigurationExcluderTest.php

...r/tests/src/Kernel/PathExcluder/SiteFilesExcluderTest.php

...ts/src/Kernel/PathExcluder/SqliteDatabaseExcluderTest.php

...er/tests/src/Kernel/PathExcluder/TestSiteExcluderTest.php

...s/src/Kernel/PathExcluder/VendorHardeningExcluderTest.php

...ernel/ReadinessValidation/StagedProjectsValidatorTest.php