HHH-15317 DeepCopy fields when marking an entity non-readonly

[ahus1]

Otherwise a modification might get unnoticed in the next flush.

This is a draft PR for now as it doesn't yet contain a test case, and I'm not sure which branch to submit this one to.

I'd be happy for some advice:

• if submitting the PR for 5.6 is ok, as I'd like to see a fix for 5.6 - or should I rather submit it for 6.0?
• could you point me to a test case example I could extend that already uses some custom types?
• could the test cases be more minimized?
• between 6.0 and 5.6 some classes about user defined types changed - see migration guide. Should I eventually submit two PRs?

Thanks!

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[beikov]

Hello, please also create a PR against main and include the test you created in the PR. You can create a new test, preferrably in the org.hibernate.orm.test.readonly package. Create new entities similar to e.g. org.hibernate.orm.test.annotations.basic.CollectionAsBasicTest and write your test similar to org.hibernate.orm.test.readonly.ReadOnlyTest.

[ahus1]

Obsolete due to the work in #7355