[6.2.0] Deduplicate concurrent computations of the same Merkle tree. #18015
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Currently, it's possible for concurrent actions to end up computing the same Merkle tree, even when the cache is enabled. This change makes it so that a later action waits for the completion of the computation started by an earlier action.
Progress on #17923.
Closes #17995.
Commit: 6d6fa81
PiperOrigin-RevId: 522319291
Change-Id: I68ab952ed6357027ec71a67a104f91a684a7a040