[smart_holder] Replace all SMART_HOLDER_WIP comments with reminders, notes, or pointers. #5336
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Description
The SMART_HOLDER_WIP comments are mostly from 2021. In the meantime, the smart_holder code was extremely thoroughly tested in the Google codebase (production code). Additionally, testing via PyCLIF-pybind11 provided thousands of diverse use cases that needed to satisfy many million unit tests (the success rate was about 99.999%).
Suggested changelog entry: