HHH-7807 - Cascade delete revisions

Conflicts:
	documentation/src/main/docbook/devguide/en-US/Envers.xml
	hibernate-envers/src/main/java/org/hibernate/envers/configuration/GlobalConfiguration.java
	hibernate-envers/src/main/java/org/hibernate/envers/configuration/metadata/AuditMetadataGenerator.java
HHH-7807 - key-many-to-one cascade removal tests
HHH-8420 multiple test-only fixes from matrix failures