Race condition error in `recursive_property`

[Liam-DeVoe]

Part of #4451. I have seen this error rarely when testing with multiple threads. As a debugging measure, I added a per-name lock around the entirety of recursive_property, but still saw this occur. My guess is a race in mapping somehow, such that a strategy doesn't get the cache_key set when we expect it to. But I'm not sure how this could happen.

Keywords for searchers: cached_is_empty, cached_is_cacheable.

 ~/Desktop/Liam/coding/hypothesis λ PYTEST_RUN_PARALLEL_VERBOSE=1 p1 -k test_intervalset --parallel-threads 2 -s --hypothesis-profile=threading

 ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――― test_error_for_index_of_not_present_value ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――
Traceback (most recent call last):
  File "/Users/tybug/Desktop/Liam/coding/hypothesis/hypothesis-python/tests/cover/test_intervalset.py", line 43, in test_error_for_index_of_not_present_value
    @example(intervals=IntervalSet(()), v=0)
                   ^^^
  File "/Users/tybug/Desktop/Liam/coding/hypothesis/hypothesis-python/src/hypothesis/core.py", line 1877, in wrapped_test
    arguments, kwargs, stuff = process_arguments_to_given(
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/tybug/Desktop/Liam/coding/hypothesis/hypothesis-python/src/hypothesis/core.py", line 755, in process_arguments_to_given
    s.validate()
  File "/Users/tybug/Desktop/Liam/coding/hypothesis/hypothesis-python/src/hypothesis/strategies/_internal/strategies.py", line 482, in validate
    self.do_validate()
  File "/Users/tybug/Desktop/Liam/coding/hypothesis/hypothesis-python/src/hypothesis/strategies/_internal/lazy.py", line 161, in do_validate
    w.validate()
  File "/Users/tybug/Desktop/Liam/coding/hypothesis/hypothesis-python/src/hypothesis/strategies/_internal/strategies.py", line 484, in validate
    self.has_reusable_values
  File "/Users/tybug/Desktop/Liam/coding/hypothesis/hypothesis-python/src/hypothesis/strategies/_internal/strategies.py", line 266, in has_reusable_values
    return recursive_property(self, "has_reusable_values", True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/tybug/Desktop/Liam/coding/hypothesis/hypothesis-python/src/hypothesis/strategies/_internal/strategies.py", line 216, in recursive_property
    return getattr(strategy, cache_key)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'IntegersStrategy' object has no attribute 'cached_has_reusable_values'. Did you mean: 'calc_has_reusable_values'?