ref(feedback): move userreport ingest and endpoints to feedback module

[aliu39]

User reports are the same product as feedback and owned by replay team. I'd like to move the code here for organizational purposes. Same goes for the feedback summary endpoint. This PR only moves things around, no implementation changes.

Ref REPLAY-513: [PR Tracker] refactor backend user feedback code

I plan to follow up with quality improvements to the ingest functions, making them more composable, so the ingest/usecases modules are subject to change.

[aliu39]

Doing in the next follow up

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
27196	1	27195	232

View the top 1 failed test(s) by shortest run time

tests.sentry.llm.test_openai::test_complete_prompt

Stack Traces | 0.051s run time

#x1B[1m#x1B[.../sentry/llm/test_openai.py#x1B[0m:38: in test_complete_prompt
    assert res == ""
#x1B[1m#x1B[31mE   AssertionError: assert 'not spam' == ''#x1B[0m
#x1B[1m#x1B[31mE     #x1B[0m
#x1B[1m#x1B[31mE     + not spam#x1B[0m

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[aliu39]

Re: cursor - yes this is a metrics change I intentionally bundled in. We don't have a dashboard widget or monitor on this metric so going to rename it to match the other metrics in the file

[aliu39]

todo in follow-up: make a way to share mock_produce_occurrence patching logic, so paths don't have to be changed in so many test files every time we move or rename things.