Replace request account with user in templates

[Simrayz]

Scope and purpose

Resolves #3601. Depends on changes in #3599 and #3601.

This pull request

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

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

[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

[github-actions]

Test results

  3 files    3 suites   0s ⏱️
219 tests 219 ✅ 0 💤 0 ❌
222 runs  222 ✅ 0 💤 0 ❌

Results for commit e8dc226.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.20%. Comparing base (8b83fa9) to head (e8dc226).

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #3614       +/-   ##
===========================================
+ Coverage   62.51%   80.20%   +17.69%     
===========================================
  Files         611        6      -605     
  Lines       45020      197    -44823     
  Branches       43       43               
===========================================
- Hits        28142      158    -27984     
+ Misses      16868       29    -16839     
  Partials       10       10               

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