Update diagnostic sending logic so it doesn't use EP alerts queue. #171381
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Summary
Currently, the diagnostic task is enqueueing alerts onto the production queue. This is problematic and likely causes a lot of EP alert telemetry loss in busy clusters. There is also a 100/1m cap on the queue which is also a bottleneck for the diagnostic feed. I'm following up with a bigger PR to move this query to a PIT query.
Checklist
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