Add a celery task to publish/unpublish rulemakings

[pkfec]

Summary (required)

This PR adds a cron job that publishes and unpublishes rulemakings in the OpenSearch service

1. refresh_most_recent_rulemakings runs every minute (this interval can be adjusted; it’s currently set to two minutes for testing). It checks for recently updated rulemakings, processes them, and sends a detailed message to the bots Slack channel.
2. send_alert_daily_modified_rulemakings runs at the end of the day and sends a summary of updated rulemakings. This task is included for testing purposes and may not be needed long term; we can revisit and remove it later.

• Resolves Add a celery task to upload rulemakings to elasticsearch #6436

Required reviewers

2 or more developers

Impacted areas of the application

rulemaking/search/ api

How to test

• Deploy this test branch to Dev space
• Rulemakings 1989-01 and 2020-05 are being used for testing. Update the pg_date, publish_flag values in rulemaster table to trigger the cron job.
• When a rulemaking is unpublished, verify worker app log. For testing, slack alerts are sent totest-botchannel
• Verify that the unpublished rulemakings no longer show on the Dev cms and api:
  - https://dev.fec.gov/legal/search/rulemakings/
  - https://fec-dev-api.app.cloud.gov/v1/rulemaking/search/?rm_no=2020-05
  - https://fec-dev-api.app.cloud.gov/v1/rulemaking/search/?rm_no=1998-01

[codecov]

Codecov Report

❌ Patch coverage is 4.10959% with 70 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.46%. Comparing base (6c6e57b) to head (4bd7528).

Files with missing lines	Patch %	Lines
webservices/tasks/legal_docs.py	0.00%	54 Missing ⚠️
webservices/legal/rulemaking_docs/rulemaking.py	11.11%	16 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6473      +/-   ##
===========================================
- Coverage    86.99%   86.46%   -0.53%     
===========================================
  Files           98       98              
  Lines        10048    10114      +66     
===========================================
+ Hits          8741     8745       +4     
- Misses        1307     1369      +62     

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