HHH-19104 backport to 6.6; Envers - Reset ReflectionTools cache on disintegration

[gsmet]

Backport of #9699 to 6.6.

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https://hibernate.atlassian.net/browse/HHH-19104

[jin-harmoney]

@yrodiere any idea why the test compilation failed? I checked the pipeline output, but I don't see an immediate link with the changes in the PR.

[yrodiere]

> Task :hibernate-core:compileTestJava
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use or override a deprecated API that is marked for removal.
Note: Recompile with -Xlint:removal for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
compiler message file broken: key=compiler.misc.msg.bug arguments=11.0.12, {1}, {2}, {3}, {4}, {5}, {6}, {7}
java.lang.AssertionError: isSubtype UNKNOWN
	at jdk.compiler/com.sun.tools.javac.code.Types$4.visitType(Types.java:1123)
	at jdk.compiler/com.sun.tools.javac.code.Types$4.visitType(Types.java:1100)
	at jdk.compiler/com.sun.tools.javac.code.Type.accept(Type.java:214)
	at jdk.compiler/com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4857)
	at jdk.compiler/com.sun.tools.javac.code.Types.isSubtype(Types.java:1096)
	at jdk.compiler/com.sun.tools.javac.code.Types.isSubtypeUncheckedInternal(Types.java:1022)

This happens on the s390x build, which uses OpenJ9, so it's either something in this PR that doesn't work with OpenJ9, or something failing already on the target branch, or simply something wrong on the worker node. I need to check.

[yrodiere]

Let's see what happens on #9704

[yrodiere]

Let's see what happens on #9704

Same problem there, so it's unrelated. Let's wait for the remaining builds to complete (Quarkus, TCK) and then merge.