Merge #17018: tests: Add descriptor Parse(...) fuzzing harness
b5ffa9f3dbff7dd008d4d00a88590d411ef991f2 tests: Add Parse(...) (descriptor) fuzzing harness (practicalswift)
fdef8bbf2f824a87f70b755155e9e1a8cd19fdcb tests: Allow for using non-default fuzzing initialization (practicalswift)
Pull request description:
Add `Parse(...)` (descriptor) fuzzing harness.
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Depends on D6880
Backport of Core PR17018