Summary

The initial idea was to deprecate ClassCleanupBehavior.EndOfAssembly and remove it in a later release (see #1541) but given that we already did the breaking change of replacing default from EndOfAssembly to EndOfClass (see #1316), it seems that people who would be broken would already have to do fix their tests so we could directly guide them toward using AssemblyCleanup.

AB#1736146