[AAP-50420] Add Default JWT Algorithms (#820)

## Description
<!-- Mandatory: Provide a clear, concise description of the changes and
their purpose -->
- What is being changed? Updates the default for `JWT_ALGORITHMS`. If
not specified, we will use the default from
`OpenIdConnectAuth.JWT_ALGORITHMS`
- Why is this change needed? This change is needed to ensure a sane
default set of JWT_ALGORITHMS is applied, if none are specified.
- How does this change address the issue? This change addresses the
issue, by ensuring we apply a default, instead of specifying None.
- 
This PR is an optional alternative to #821 

## Type of Change
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- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] Documentation update
- [ ] Test update
- [ ] Refactoring (no functional changes)
- [ ] Development environment change
- [ ] Configuration change

## Self-Review Checklist
<!-- These items help ensure quality - they complement our automated CI
checks -->
- [x] I have performed a self-review of my code
- [x] I have added relevant comments to complex code sections
- [x] I have updated documentation where needed
- [x] I have considered the security impact of these changes
- [x] I have considered performance implications
- [x] I have thought about error handling and edge cases
- [x] I have tested the changes in my local environment

## Testing Instructions
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<!-- Must be detailed enough for reviewers to reproduce -->
### Prerequisites
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### Steps to Test
1. Create a Generic OIDC authenticator without specifying any algorithms
2. Ensure default algorithm is populated upon save.
3. 

### Expected Results
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## Additional Context
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### Required Actions
<!-- Check if changes require work in other areas -->
<!-- Remove section if no external actions needed -->
- [ ] Requires documentation updates
  <!-- API docs, feature docs, deployment guides -->
- [ ] Requires downstream repository changes
  <!-- Specify repos: django-ansible-base, eda-server, etc. -->
- [ ] Requires infrastructure/deployment changes
  <!-- CI/CD, installer updates, new services -->
- [ ] Requires coordination with other teams
  <!-- UI team, platform services, infrastructure -->
- [ ] Blocked by PR/MR: #XXX
  <!-- Reference blocking PRs/MRs with brief context -->

### Screenshots/Logs
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---------

Co-authored-by: John Westcott IV <[email protected]>

Author: zkayyali812

ansible_base/authentication/authenticator_plugins/oidc.py

@@ -124,7 +124,7 @@ class OpenIdConnectConfiguration(BaseAuthenticatorConfiguration):
 
     JWT_ALGORITHMS = ListField(
         help_text=_("The algorithm(s) for decoding JWT responses from the IDP."),
-        default=None,
+        default=OpenIdConnectAuth.JWT_ALGORITHMS,
         allow_null=True,
         validators=[JWTAlgorithmListFieldValidator()],
         ui_field_label=_('OIDC JWT Algorithm(s)'),