Fix a race when collecting list ongoing transactions. #22042
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Scope & Purpose
The GET /_api/transaction API was missing a lock which could lead to undefined behavior if a transaction would update its state at the same time while we are collecting its details.
Checklist
Tests
I was thinking about adding a regression test, but it is only a small change and designing a test for this specific issue would have been very akward because we need to jump through a lot of hoops to artifically construct the relevant situation.
📖 CHANGELOG entry made