Fix rare TestResumption deadlock #44810
Merged
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This PR disables the periodic reconnection ticker before running the reconnection-on-drop loop instead of resetting the ticker at the end of the loop. This enables TestResumption to correctly wait for the ticker to be running before advancing the fake clock that triggers the periodic reconnection in the test, which can very rarely deadlock in tests. The observable behavior of the resumable connection client is unaltered.