[v10.4.x] Alerting: Return a 400 and errutil error when trying to delete a contact point that is referenced by a policy #86162
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Backport 5b1498f from #85481
What is this feature?
Don't return a 500 for this, it's a user error.
Add errutil errors for good measure.
Why do we need this feature?
Fix the status code, such that it's not tracked as a 500 in metrics. When it's a 500, it hurts SLOs for no reason.
Which issue(s) does this PR fix?:
n/a
Special notes for your reviewer:
Please check that: