[AAP-50140]: Change azure ad authenticator plugin group setting default from Group to groups (#798)

## Description
<!-- Mandatory: Provide a clear, concise description of the changes and
their purpose -->
- What is being changed?
Changing the Azure AD authenticator plugin default value for the setting
GROUPS_CLAIM from `Group` to `groups` per AAP-50140

- Why is this change needed?
This aligns the Azure AD plugin better with the default values that come
from EntraID (aka Azure AD)

- How does this change address the issue?
The default value for new authenticators would now correctly be set.

## Type of Change
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- [ ] 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
- [X] Configuration change

## Self-Review Checklist
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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 new authenticator plugin of type AzureAD note that the
default value for GROUPS_CLAIMS should now be groups instead of Group.
2. 
3. 

### Expected Results
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## Additional Context
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### Required Actions
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- [ ] 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
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### Screenshots/Logs
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Author: john-westcott-iv

ansible_base/authentication/authenticator_plugins/azuread.py

@@ -41,7 +41,7 @@ class AzureADConfiguration(BaseAuthenticatorConfiguration):
         help_text=_("The JSON key used to extract the user's groups from the ID token or userinfo endpoint."),
         required=False,
         allow_null=False,
-        default="Group",
+        default="groups",
         ui_field_label=_("Groups Claim"),
     )