Allow configuring a custom CA with redis tls

[ewdurbin]

Similar to #3450, allows users with custom or third-party Certificate Authorities (Like AWS Elasticache) to fully validate TLS.

Code Changes

• Adds a ssl_ca_certs configuration to the redis cache for setting a path to a CA certificate to validate TLS against.

Steps to Confirm

• Configure a redis instance with a self-signed certificate or private CA signed certificate and note that TLS validates when using ssl_cert_reqs="required".

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Documentation:
  • documentation complete, PR opened in fidesdocs
  • documentation issue created in fidesdocs
• Issue Requirements are Met
• Relevant Follow-Up Issues Created
• Update CHANGELOG.md
• For API changes, the Postman collection has been updated

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (d638d66) 87.12% compared to head (6810af1) 87.13%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3451      +/-   ##
==========================================
+ Coverage   87.12%   87.13%   +0.01%     
==========================================
  Files         312      312              
  Lines       18757    18761       +4     
  Branches     2389     2390       +1     
==========================================
+ Hits        16342    16348       +6     
+ Misses       1991     1989       -2     
  Partials      424      424              

Impacted Files	Coverage Δ
src/fides/api/util/cache.py	93.80% <ø> (ø)
src/fides/core/config/redis_settings.py	93.33% <100.00%> (+10.40%)	⬆️

... and 2 files with indirect coverage changes

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[ThomasLaPiana]

LGTM! Great change, waiting for CI checks to pass before merging

[ThomasLaPiana]

remaining failures are intermittent

[ewdurbin]

remaining failures are intermittent

Known intermittent or introduced by my changeset 🙈