[11.x] Test for forgetting non-flexible keys for file driver #53018
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There has been a report that recent changes regarding flexible keys have caused exceptions to be thrown in scenarios involving fibers in foreach within a long running process. I've been unable to reproduce the issue.
This PR addresses the exception and also slightly improves the general flow for flexible keys by checking for the existence of the flexible key before attempting to delete it and only attempting to delete the flexible key when the main key, the non-flexible version, was successfully forgotten.