feat: Create Django Command for Deleting Rate Limit Redis Keys

[ajay-sentry]

Purpose/Motivation

This PR adds a new django command to be run on CRON clearing any lingering users who may have had a redis key for their rate limit failing to expire.

The command runs only on user's (non-anon) by default, but an option can be passed in to run the deletion on anon users instead as well. We utilize the scan_iter function on redis because it's capable of having a regex path passed in, from which we go through and delete each of the keys. We only delete keys which have no TTL (comes back as -1 when you call the ttl function)

Redis Scan Docs - https://redis.io/docs/latest/commands/scan/

Redis TTL Docs - https://redis.io/docs/latest/commands/ttl/

Closes #2527

Will need the second half to be completed by codecov/engineering-team#2588

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[codecov-notifications]

Codecov Report

Attention: Patch coverage is 84.21053% with 3 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
core/management/commands/delete_rate_limit_keys.py	84.21%	3 Missing ⚠️

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[codecov]

Codecov Report

Attention: Patch coverage is 84.21053% with 3 lines in your changes missing coverage. Please review.

Project coverage is 96.31%. Comparing base (cdebb02) to head (392e9d8).
Report is 7 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
core/management/commands/delete_rate_limit_keys.py	84.21%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #935      +/-   ##
==========================================
+ Coverage   96.23%   96.31%   +0.08%     
==========================================
  Files         823      825       +2     
  Lines       18972    19476     +504     
==========================================
+ Hits        18257    18759     +502     
- Misses        715      717       +2     

Flag	Coverage Δ
unit	92.49% <84.21%> (+0.01%)	⬆️
unit-latest-uploader	92.49% <84.21%> (+0.01%)	⬆️

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