fix: Check if a valid GitHub installation exists

[novakzaballa]

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• I have used a Conventional Commit title for this Pull Request

Changes

• Add a status field into GithubConfiguration model.
• Changes when creating a comment on GitHub notifying the change of a feature flag.
• Check if installation_id is valid.
• Move call_github_app_webhook_for_feature_state task out from api/features/tasks.py to trigger_feature_state_change_webhooks_signal.

How did you test this code?

• Unit Tests added

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[github-actions]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 70.47619% with 31 lines in your changes are missing coverage. Please review.

Project coverage is 95.86%. Comparing base (53e728a) to head (8dd0cc9).
Report is 14 commits behind head on main.

Files	Patch %	Lines
api/integrations/github/client.py	33.33%	12 Missing ⚠️
api/features/signals.py	53.33%	7 Missing ⚠️
api/features/tasks.py	25.00%	6 Missing ⚠️
api/integrations/github/views.py	83.33%	4 Missing ⚠️
api/integrations/github/models.py	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3893      +/-   ##
==========================================
- Coverage   95.87%   95.86%   -0.01%     
==========================================
  Files        1133     1135       +2     
  Lines       35873    36046     +173     
==========================================
+ Hits        34393    34556     +163     
- Misses       1480     1490      +10     

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