Minor change to how LoginForm and RegisterFormV2 is created/modified

[jwag956]

The default LoginForm now reflects the default configuration - email is required. In init_app() build_login_form() is called that if USERNAME_ENABLE is set will add the username field (as before) and change the email field to be Optional(). This is a small semantic change - prior the email field was not marked as required.

Change the new RegisterFormV2 construction - now the default form reflects the default configuration - new_password and confirm_password are required. From init_app build_register_form() is called and it will: 1) remove password_confirm field if PASSWORD_CONFIRM_REQUIRED is False 2) add username field if USERNAME_ENABLE is True
3) mark the password field as optional if PASSWORD_REQUIRED is False or UNIFIED_SIGNING is True

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.39%. Comparing base (682eabe) to head (c5f9fba).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1053      +/-   ##
==========================================
- Coverage   98.39%   98.39%   -0.01%     
==========================================
  Files          37       37              
  Lines        4862     4857       -5     
==========================================
- Hits         4784     4779       -5     
  Misses         78       78              

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