lru cache: Only send notifications to the new subscriber #5281
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When there's a new subscription to the cache we shouldn't notify all existing subscriptions. That causes them to receive updates even if there was no change to the SVIDs or bundles.
This can cause issues with users that trigger side effects, such as restarting a service, when they receive updates on the X509 stream.
I think this shouldn't be ok, I didn't see any reason for the cache notify all subscribers of a set if it knows the new subscriber already.
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Which issue this PR fixes
fixes #5280