fix(tenant): fix delete tenants behavior

[vicferpoy]

Context

When trying to delete a tenant, the related membership would be removed before that and the RLS policy would block the tenant deletion. In addition, users without a tenant membership would exist in the database, preventing from creating a new one for a new tenant.

Description

The DELETE /tenents/<id> endpoint now does the following:

• During the request, it deletes (leading to immediate impact for the user):
  • Memberships to that tenant.
  • Users without any membership.
• Creates a background task, agnostic to the user, deleting in batches all the related resources from the tenant and the tenant itself.

As this endpoint applies a system background task, the response will still be a 204.

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[prowler-bot]

💚 All backports created successfully

Status	Branch	Result
✅	v5.0

Questions ?

Please refer to the Backport tool documentation and see the Github Action logs for details

[codecov]

Codecov Report

Attention: Patch coverage is 92.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 92.90%. Comparing base (32d8da2) to head (25d19c4).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
api/src/backend/api/base_views.py	76.47%	4 Missing ⚠️
api/src/backend/api/v1/views.py	88.88%	1 Missing ⚠️
api/src/backend/tasks/tasks.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6013      +/-   ##
==========================================
- Coverage   92.91%   92.90%   -0.02%     
==========================================
  Files          59       59              
  Lines        5040     5102      +62     
==========================================
+ Hits         4683     4740      +57     
- Misses        357      362       +5     

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