Issue #3263223 by phenaproxima: All kernel tests should use a virtual project

.../Validator/PackagesInstalledWithComposerValidatorTest.php

.../src/Kernel/Validator/UpdatePackagesTypeValidatorTest.php

...tests/src/Kernel/Validator/UpdateReleaseValidatorTest.php

package_manager/package_manager.services.yml

...age_manager/src/Validator/WritableFileSystemValidator.php

...ager/tests/src/Kernel/ComposerExecutableValidatorTest.php

...anager/tests/src/Kernel/ComposerSettingsValidatorTest.php

package_manager/tests/src/Kernel/DiskSpaceValidatorTest.php

package_manager/tests/src/Kernel/LockFileValidatorTest.php

package_manager/tests/src/Kernel/MultisiteValidatorTest.php

...manager/tests/src/Kernel/PackageManagerKernelTestBase.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

..._manager/tests/src/Kernel/PendingUpdatesValidatorTest.php

package_manager/tests/src/Kernel/SettingsValidatorTest.php

package_manager/tests/src/Kernel/StageEventsTest.php