chore(seer): add seer scanner rate limit

[roaga]

Adds a rate limit for starting seer scanner tasks (default 1000 per hour per project) to prevent surprise bills.

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 9 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...try/integrations/utils/issue_summary_for_alerts.py	50.00%	3 Missing ⚠️
src/sentry/seer/issue_summary.py	57.14%	3 Missing ⚠️
src/sentry/tasks/post_process.py	50.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #93652      +/-   ##
==========================================
- Coverage   88.05%   88.01%   -0.04%     
==========================================
  Files       10328    10328              
  Lines      597122   595732    -1390     
  Branches    23141    23141              
==========================================
- Hits       525778   524323    -1455     
- Misses      70851    70916      +65     
  Partials      493      493              

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ OperationalError: connection to server at "127.0.0.1", port 6432 failed: FATAL: no more connections allowed (max_client_conn) digests:sentry.tasks.digests.deliver_digest View Issue
• ‼️ OperationalError: connection to server at "127.0.0.1", port 6432 failed: FATAL: no more connections allowed (max_client_conn) digests:sentry.tasks.digests.deliver_digest View Issue

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