Allow email address changes for users

[gzurowski]

• Enable allauth feature for updating a user's email addresss (self-service).
• Add endpoint for triggering the email update flow.

[chatgpt-codex-connector]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 96.29630% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 78.76%. Comparing base (539e4ea) to head (e4f8cf5).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/user/views/user_views.py	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3224      +/-   ##
==========================================
+ Coverage   78.75%   78.76%   +0.01%     
==========================================
  Files         610      610              
  Lines       34334    34359      +25     
==========================================
+ Hits        27039    27063      +24     
- Misses       7295     7296       +1     

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