Send NULL to firebase to enable clearing data

[tnagorra]

Depends on

• Allow None along with UNDEFINED for optional fields mapswipe-firebase#20

Changes

• firebase: send null to firebase if data is missing
• firebase: use firebase_id instead of id or old_id where missing
• firebase: update use of latest firebase schema (with deprecation support)
• firebase: remove deprecated comments
• firebase: define projectTopicKey, usernameKey nameKey
• firebase: fix issue with required projectDetails field
• pydantic: fix warning on usage of pydantic.input all_fieldsAddresses
• firebase: validate data before updating the data
• firebase: add inheritance checks to FirebasePush

This PR doesn't introduce any:

• temporary files, auto-generated files or secret keys
• n+1 queries
• flake8 issues
• print
• typos
• unwanted comments

This PR contains valid:

• tests
• permission checks (tests here too)
• translations

[codecov]

Codecov Report

❌ Patch coverage is 65.78947% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.94%. Comparing base (c24bd9d) to head (3209921).
⚠️ Report is 7 commits behind head on develop.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
apps/common/firebase.py	45.83%	9 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #88      +/-   ##
===========================================
- Coverage    82.05%   81.94%   -0.12%     
===========================================
  Files          145      145              
  Lines         6086     6103      +17     
  Branches       517      522       +5     
===========================================
+ Hits          4994     5001       +7     
- Misses         911      918       +7     
- Partials       181      184       +3     

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