Bug fixes and Missing functionality implementation for Enabling UMG in UST

[NishantVarshnay28]

Summary

Currently, UST does not support UMG (user in multiple groups). To enable this feature, a PR exists: link. This PR includes bug fixes and missing functionality from the previously mentioned PR.

The fixes include:

• Correcting the Group Admin logic when updating an existing user. Initially, if a user had group admin access to a group and later the group was removed from the group_admin list but still existed in the directory group, the group was being removed instead of just revoking the admin privileges.
• Ensuring groups are created with the correct case as specified in the config file, instead of always in lowercase.
• Fixing the issue where group creation failed if the group was part of a different directory group.
• Resolving primary group issues when updating the user.
• Adding conditional code to execute only when UMG is enabled.
• Correcting typos.

Testing Steps

• This PR is just a fixes to PR . Testing Steps to mentioned when we open entire UMG enablement PR to v2 Branch. Please refer to this wiki for more details: https://wiki.corp.adobe.com/pages/viewpage.action?spaceKey=dmeservices&title=Sign+Sync+UMG

Fixes #xxx