Issue #3499593 by mondrake, smustgrave: Fix phpunit.* PHPStan baseline errors

core/.phpstan-baseline.php

core/modules/block/tests/src/Kernel/BlockRebuildTest.php

...s/layout_builder/tests/src/Kernel/EntityViewAlterTest.php

...odules/migrate/tests/src/Kernel/MigrateSourceTestBase.php

...modules/node/tests/src/Functional/NodeRevisionsUiTest.php

core/modules/update/tests/src/Unit/UpdateMailTest.php

.../workspaces/tests/src/Kernel/WorkspaceIntegrationTest.php