[NOREF] Add env vars for cache time and to bypass cache

[mynar7]

NOREF

Changes and Description

• Adds the CEDAR_CACHE_EXPIRE_TIME environmental variable to allow for setting the length of time the nginx proxy caches requests without directly modifying the nginx config. Setting a new cache time will require a manual redeploy of the nginx proxy though due to GitHub action only monitoring for changes to the /cedarproxy folder or the swagger client.
• Adds the CEDAR_CORE_SKIP_PROXY env var that allows for bypassing the nginx proxy if desired.
  • Note: This would require a manual redeploy though since the variable is read in on server start. It might make sense to revisit how we implement env vars or use launchdarkly instead.
• Adds a proxy_cache_use_stale rule to nginx that allows for returning older responses in the event of timeouts, errors, etc.

PR Author Review Checklist

• Met the ticket's acceptance criteria, or will meet them in a subsequent PR.
• Added or updated tests for backend resolvers or other functions as needed.
• Added or updated client tests for new components, parent components, functions, or e2e tests as necessary.
• Tested user-facing changes with voice-over and the rotor menu

PR Reviewer Guidelines

• It's best to pull the branch locally and test it, rather than just looking at the code online!
• Check that all code is adequately covered by tests - if it isn't feel free to suggest the addition of tests.
• Always make comments, even if it's minor, or if you don't understand why something was done.