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Acquire qpmulti->mutex during destruction

Tony Finch requested to merge 4070-tsan-qpmulti-destroy into main

Thread sanitizer warns that parts of the qp-trie are accessed both with and without the mutex; the unlocked accesses happen during destruction, so they should be benign, but there's no harm locking anyway to convince tsan it is clean.

Also, ensure .tsan-suppress and .tsan-suppress-extra are in sync.

Closes #4070 (closed) and #4073 (closed)

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