Add OS version and NAV version to exception debug view

[aleksfl]

Scope and purpose

Fixes #2082.

Adds versions under "Settings" header

This pull request

• adds/changes/removes a dependency

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
• 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.

[github-actions]

Test results

    27 files      27 suites   45m 9s ⏱️
 2 665 tests  2 665 ✅ 0 💤 0 ❌
19 710 runs  19 710 ✅ 0 💤 0 ❌

Results for commit 69ee8a3.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.82%. Comparing base (1019a55) to head (69ee8a3).
⚠️ Report is 26 commits behind head on master.

Files with missing lines	Patch %	Lines
python/nav/django/settings.py	62.50%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3645      +/-   ##
==========================================
+ Coverage   62.67%   62.82%   +0.14%     
==========================================
  Files         611      611              
  Lines       45100    45133      +33     
  Branches       43       43              
==========================================
+ Hits        28266    28354      +88     
+ Misses      16824    16769      -55     
  Partials       10       10              

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[hmpf]

What does this do on, say, FreeBSD?

[aleksfl]

Now it should produce a decent output for other OSes like FreeBSD using the windows template, although it won't be as neat as for the big 3.

[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