Delegate EmailAddress creation to allauth

[Marishka17]

Motivation and context

This PR fixes an issue where a user cannot log in if they were invited to an organization using an email address with uppercase letters, but then manually registered using the same email address in lowercase.

This issue occurs when the CVAT server is configured with required email verification (ACCOUNT_EMAIL_VERIFICATION = "mandatory"). There is a bug in dj_rest_auth when django allauth version is < 0.62 is used. The old django allauth versions do not "normalize" emails during registration, but use register-independent email filtration. That means if an EmailAddress (from django allauth) is created in another register than User.email -> dj_rest_auth raises an exception (email is not verified).

FYI, starting from version 0.62.0, django-allauth changed how it stores and manages email addresses. In the latest version, email addresses are converted to lowercase during registration, while a case-sensitive search is used during login.
Documentation: https://docs.allauth.org/en/latest/account/email.html
Related changes: pennersr/django-allauth@4bb94eb

How has this been tested?

manually

Checklist

• I submit my changes into the develop branch
• I have created a changelog fragment
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues (see GitHub docs)

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.42857% with 8 lines in your changes missing coverage. Please review.

Project coverage is 71.96%. Comparing base (89704ed) to head (97dcb80).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9629      +/-   ##
===========================================
+ Coverage    71.76%   71.96%   +0.20%     
===========================================
  Files          441      441              
  Lines        46374    46359      -15     
  Branches      3960     3960              
===========================================
+ Hits         33279    33362      +83     
+ Misses       13095    12997      -98     

Components	Coverage Δ
cvat-ui	77.72% <ø> (+0.02%)	⬆️
cvat-server	67.39% <71.42%> (+0.34%)	⬆️

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[sonarqubecloud]

Quality Gate failed

Failed conditions
2 Security Hotspots

See analysis details on SonarQube Cloud