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src: trace_events: fix race with metadata events

Rodrigo Muino Tomonari requested to merge github/fork/ofrobots/fix/24129 into master

Multiple threads may be concurrently adding to the metadata_events list. Protect access with a mutex.

Fixes: https://github.com/nodejs/node/issues/24129

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines

CI: https://ci.nodejs.org/job/node-test-pull-request/19827/ https://ci.nodejs.org/job/node-test-pull-request/19975/

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