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This is the final PR (apart from potential bug fixes) for #128682.
It:

• Handles DECREF_INPUTS by either:
  • setting the on-stack references to NULL before closing them, or
  • where more efficient, setting the stack pointer before each reference is closed
• Changes many uses of DECREF_INPUTS to PyStackRef_CLOSE where there was only one input.
• Adds asserts that the stack pointer is spilled at key points outside of the interpreter.

• Issue: Consistently spill the evaluation stack when making escaping calls #128682

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Some tests are failing.

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This change introduced a regression on opcodes using PyStackRef_AsPyObjectSteal() like CALL_LIST_APPEND: see issue gh-151818.