Allow district admin to delete users

[Ashesh3]

Frontend PR: coronasafe/care_fe#6781

Proposed Changes

In this commit, a new filter condition has been added specifically for the DistrictAdmin user type in the users API viewsets. More specifically, in the destroy function. Previously, if a user had a request that passed through this function, it would only check if the user's type is less than StateAdmin and hence not a superuser.

Now, besides the pre-existing conditions (user type is less than StateAdmin and not a superuser), if the user type is DistrictAdmin, an additional filter is applied. The filter checks if the district field of the user matches the district of the request.user and also verifies if the user type is less than DistrictAdmin and not a superuser.

Thus, this commit essentially grants a finer degree of control to the District Administrators in managing users under their jurisdiction i.e., the same district. It is important to note that this patch restricts the DistrictAdmin from deleting users of the same type or higher and the superusers, thus putting checks on their privileges.

Associated Issue

• User Deletion Privilege should be given to district admin and above care_fe#6716

@coronasafe/care-backend-maintainers @coronasafe/care-backend-admins

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (8bdbb42) 60.76% compared to head (8c4dbf3) 60.75%.

Files	Patch %	Lines
care/users/api/viewsets/users.py	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1738      +/-   ##
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- Coverage   60.76%   60.75%   -0.02%     
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  Files         210      210              
  Lines       11531    11533       +2     
  Branches     1642     1643       +1     
==========================================
  Hits         7007     7007              
- Misses       4283     4284       +1     
- Partials      241      242       +1     

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