[13.0] Fix: reserved connection retry logic when vttablet or mysql is down #10052
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Description
This is backport PR of #10005
This PR fixes issues with reserved connection when the vttablet or the underlying MySQL process is down.
The VTGate needs to understand the error codes/messages to redirect it to the new available tablet.
In all the above scenarios the current reserved connection held should be dropped and a new one should be created by calling the ReserveExecute API to the tablet.
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