[stable14] Unique contraint and deadlock fixes for filecache and file_locks #12433
* fixes #9305 by not being prone to the race condition in insertIfNotExists * fixes #6899 by not using a query that can result in a deadlock * replaces the insertIfNotExists call with an insert which is wrapped into a try-catch block * followup to #12371 Signed-off-by: Morris Jobke <email@example.com>
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