chore(metrics-summaries): Remove metrics summaries queries and endpoints

[phacops]

The metrics summaries are not needed anymore since we shut down DDM.

This will remove the query layer and endpoints used by the frontend to list samples associated with metrics.

https://github.com/getsentry/team-ingest/issues/544

[sentry]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: src/sentry/utils/snuba.py

Function	Unhandled Issue
_apply_cache_and_build_results	RateLimitExceeded: Query on could not be run due to allocation policies, info: {'details': {'ConcurrentRateLimitAllo... ... Event Count: 11
_apply_cache_and_build_results	RateLimitExceeded: Query on could not be run due to allocation policies, info: {'details': {'BytesScannedRejectingPo... ... Event Count: 7

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[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/sentry/api/endpoints/organization_traces.py	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #81133      +/-   ##
==========================================
- Coverage   80.33%   80.29%   -0.05%     
==========================================
  Files        7223     7219       -4     
  Lines      320112   319454     -658     
  Branches    20779    20779              
==========================================
- Hits       257174   256492     -682     
- Misses      62545    62569      +24     
  Partials      393      393              

[Zylphrex]

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