Privilege assignment to Group fails

[pdaterao]

Describe the bug
Privilege assignment fails in several ways after being assigned to a group.

• The same privilege cannot be assigned to another group
• The privilege cannot be removed and assigned to another group
• multi-selecting privileges in UI and saving throws errors

To Reproduce
Steps to reproduce the behavior:

New assignment

1. Go to 'Privileges' and click on the group for which privileges have to be added
2. Check the desired privilege and Save
3. If this privilege was already assigned to some group, an error is thrown.

Remove assignment

1. Go to 'Privileges' and click on the group for which privileges have to be modified
2. Uncheck the desired privilege and click 'Save'
3. A false success message is shown
4. Click on "Reset" or reload the page. The old privilege is still assigned.

Expected behavior

• Multiple groups should be able to have the same privilege.
• One privilege should be able to be associated with multiple groups.
• Privileges should be correctly removed from groups.

Screenshots

Desktop (please complete the following information):

• OS: Windows Server 2019
• Browser Chrome
• Version OpenAM 10.8.4

Additional context
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