feat: Introduce /admin/maintenance and expose fix top left maintenance action DEV-2805

[seakayone]

Pull Request Checklist

Task Description/Number

Issue Number: DEV-

Basic Requirements

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• fix: represents bug fixes
• refactor: represents production code refactoring
• feat: represents a new feature
• docs: documentation changes (no production code change)
• chore: maintenance tasks (no production code change)
• test: all about tests: adding, refactoring tests (no production code change)
• other... Please describe:

Does this PR introduce a breaking change?

• Yes
• No
• Maybe (not 100% sure => check with FE)

Does this PR change client-test-data?

• Yes (don't forget to update the JS-LIB team about the change)
• No

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (12402f3) 18.00% compared to head (e9e2b14) 88.12%.
Report is 86 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2877       +/-   ##
===========================================
+ Coverage   18.00%   88.12%   +70.12%     
===========================================
  Files         281      254       -27     
  Lines       28899    23281     -5618     
===========================================
+ Hits         5202    20517    +15315     
+ Misses      23697     2764    -20933     

see 241 files with indirect coverage changes

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[linear]

DEV-2805 Introduce /admin/maintenance and expose fix top left maintenance action

[BalduinLandolt]

LGTM