chore: stabilize parser tests #4940
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Summary
Recently I had introduced a guard against too much recursion in our
Debugimplementations for syntax nodes. Unfortunately it relied on atomics where threads could interfere with one another. This meant if two or more tests were running concurrently and dumping snapshots for the same node kind simultaneously, the guard could be triggered too soon, leading to unstable tests.So I'm trying again with thread-local statics.
Test Plan
Tests should stay consistently green.