Add holder caster traits tests in test_smart_ptr.cpp,py #5603
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Description
Add unit tests for these holder caster traits:
copyable_holder_caster_shared_ptr_with_smart_holder_support_enabled
move_only_holder_caster_unique_ptr_with_smart_holder_support_enabled
To be documented in the pybind11 v3.0 Upgrade guide (PR #5589).
While at it, add a matching "to demonstrate" provision to the existing
type_caster_enum_type_enabled
trait test.A changelog entry is not needed.