ref(rules): Refactor get_rate to be used for bulk queries

[ceorourke]

The apply_delayed rule processor needs to call get_rate with bulk Snuba queries (see this code block), so this PR refactors get_rate to handle that.

[saponifi3d]

generally lgtm, curious about the target branch change and your thoughts about get_start_end_from_duration though.

[ceorourke]

@saponifi3d idk why I can't reply to your comment about the branch, I'd prefer to find out now rather than later when we have a lot more going on if I somehow fucked this up

[codecov]

Codecov Report

Attention: Patch coverage is 72.41379% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 79.64%. Comparing base (6c0b883) to head (b3304fb).
Report is 1 commits behind head on master.

❗ Current head b3304fb differs from pull request most recent head 56120ee. Consider uploading reports for the commit 56120ee to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #69446       +/-   ##
===========================================
- Coverage   86.21%   79.64%    -6.58%     
===========================================
  Files        2848     6469     +3621     
  Lines      176602   287223   +110621     
  Branches    31517    49495    +17978     
===========================================
+ Hits       152261   228761    +76500     
- Misses      24338    58040    +33702     
- Partials        3      422      +419     

Files	Coverage Δ
src/sentry/rules/conditions/event_frequency.py	90.40% <72.41%> (+8.12%)	⬆️

... and 4282 files with indirect coverage changes

[nhsiehgit]

So we've now added comparison type and interval to the data fixtures to determine our rates?

a few nit comments

[ceorourke]

So we've now added comparison type and interval to the data fixtures to determine our rates?

a few nit comments

no, nothing is added. I just moved stuff around

[sentry]

Suspect Issues

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

• ‼️ KeyError: '' sentry.tasks.post_process.post_process_group View Issue
• ‼️ SnubaError: HTTPConnectionPool(host='127.0.0.1', port=10006): Read timed out. (read timeout=30) sentry.tasks.post_process.post_process_group View Issue
• ‼️ SnubaError: HTTPConnectionPool(host='127.0.0.1', port=10006): Max retries exceeded with url: /events/snql (Ca... sentry.tasks.post_process.post_process_group View Issue
• ‼️ SnubaError: HTTPConnectionPool(host='127.0.0.1', port=10006): Max retries exceeded with url: /events/snql (Ca... sentry.tasks.post_process.post_process_group View Issue
• ‼️ SnubaError: HTTPConnectionPool(host='127.0.0.1', port=10006): Max retries exceeded with url: /events/snql (Ca... sentry.tasks.post_process.post_process_group View Issue

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[sentry]

Suspect Issues

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

• ‼️ SnubaError: Failed to parse snuba error response sentry.tasks.post_process.post_process_group View Issue

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