fix(db_event): Handle other events

[jfagoagas]

Context

Partially fixes #6728

Description

Handle other events in the check rds_instance_critical_event_subscription

Checklist

• Are there new checks included in this PR? Yes / No
  • If so, do we need to update permissions for the provider? Please review this carefully.
• Review if the code is being covered by tests.
• Review if code is being documented following this specification https://github.com/google/styleguide/blob/gh-pages/pyguide.md#38-comments-and-docstrings
• Review if backport is needed.
• Review if is needed to change the Readme.md

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[puchy22]

Nice catch, thank you! 🥇

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.71%. Comparing base (545c2dc) to head (e425899).
Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6754      +/-   ##
==========================================
- Coverage   93.70%   88.71%   -4.99%     
==========================================
  Files          67     1195    +1128     
  Lines        6351    34488   +28137     
==========================================
+ Hits         5951    30595   +24644     
- Misses        400     3893    +3493     

Flag	Coverage Δ
api	?
prowler	88.71% <100.00%> (?)

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Components	Coverage Δ
prowler	88.71% <100.00%> (∅)
api	∅ <ø> (∅)

[prowler-bot]

💚 All backports created successfully

Status	Branch	Result
✅	v5.2

Questions ?

Please refer to the Backport tool documentation and see the Github Action logs for details