Support allauth for frontend authentication needs

[hmpf]

Scope and purpose

Fixes #. Dependent on #.

This pull request

• adds/changes/removes a dependency
• changes the database

Contributor Checklist

Every pull request should have this checklist filled out, no matter how small it is.
More information about contributing to NAV can be found in the
Hacker's guide to NAV.

• Added a changelog fragment for towncrier
• Added/amended tests for new/changed code
• Added/changed documentation
• Linted/formatted the code with ruff, easiest by using pre-commit
• Wrote the commit message so that the first line continues the sentence "If applied, this commit will ...", starts with a capital letter, does not end with punctuation and is 50 characters or less long. See https://cbea.ms/git-commit/
• Based this pull request on the correct upstream branch: For a patch/bugfix affecting the latest stable version, it should be based on that version's branch (<major>.<minor>.x). For a new feature or other additions, it should be based on master.
• If applicable: Created new issues if this PR does not fix the issue completely/there is further work to be done
• If it's not obvious from a linked issue, described how to interact with NAV in order for a reviewer to observe the effects of this change first-hand (commands, URLs, UI interactions)
• If this results in changes in the UI: Added screenshots of the before and after
• If this adds a new Python source code file: Added the boilerplate header to that file

[github-actions]

Test results

    8 files      8 suites   4m 56s ⏱️
2 625 tests 2 623 ✅ 0 💤 2 ❌
5 546 runs  5 544 ✅ 0 💤 2 ❌

For more details on these failures, see this check.

Results for commit ce92193.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.93%. Comparing base (d233a3d) to head (ce92193).

Files with missing lines	Patch %	Lines
python/nav/web/auth/allauth/adapter.py	78.57%	3 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##           poc/django-auth-2    #3622      +/-   ##
=====================================================
- Coverage              62.45%   59.93%   -2.53%     
=====================================================
  Files                    611      613       +2     
  Lines                  45125    45154      +29     
  Branches                  43       43              
=====================================================
- Hits                   28184    27062    -1122     
- Misses                 16931    18082    +1151     
  Partials                  10       10              

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[hmpf]

This code statrted with a TOTP tolerance of 0, but I've had to switch it to 1.

See https://www.protectimus.com/blog/time-drift-in-totp-hardware-tokens/ for why tolerance is needed and https://www.protectimus.com/token/slim/ for an offline hardware TOTP generator.

[sonarqubecloud]

Quality Gate passed

Issues
2 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