Backport of http-backend: http backend lock error return LockError instead of generic error into v1.2 #31262
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Backport
This PR is auto-generated from #31256 to be assessed for backporting due to the inclusion of the label 1.2-backport.
The below text is copied from the body of the original PR.
This PR make the http backend respect the lock-timeout flag. Currently, there is no way to wait for a lock when using http backend.
With this PR :