chore: remove outdated JWT auth related settings

[wgu-taylor-payne]

Description

This PR removes unused settings relating to JWT authentication. These settings were originally added here and here.

I originally thought the removal of these settings was related to the effort in this issue, but a closer reading revealed that issue is talking about the settings in the JWT_AUTH setting.

The settings removed in this PR appear to be redundant, unused duplicates of settings in the JWT_AUTH dictionary. I was unable to find any references in edx-platform, edx-drf-extensions, or drf-jwt where these settings were access at the top level (not through JWT_AUTH). Searching the openedx org on GitHub didn't turn up anything that used these.

Testing instructions

Remove these settings and unit tests still pass. Search these settings in relevant repos to verify they are not used.

Other considerations

Is there anywhere else that needs to be searched? Would this removal need to be categorized as a breaking change?

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[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.