fix(cache): add check for redis empty results in deleteMatching #4628
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Description
The deleteMatching implementation for the RedisHandler is not deleting all matching cache items as intended.
This PR is meant to fix that bug and fix the tests that were supposed to fail.
Also, the deleteMatching method now returns the number of deleted items as it is offers better feedback than true/false (mainly for testing purposes).
Thanks to @benjaminbellamy for the heads up!
Checklist: