Disable edit default quota button when not editable

[hpoettker]

Comprehensive summary of your change

The PR disables the edit button for the default quota space per project when the configuration property storage_per_project is set to not editable, which is e.g. the case when the environment variable CONFIG_OVERRIDE_JSON is set for the core.

Issue being fixed

Currently the edit button is always enabled and the modal dialog for changing the default quota space always opens. When however the property storage_per_project is not editable, a submission in the modal dialog will lead to the error message Save abort because nothing changed being displayed, and the modal dialog can only be exited by clicking the cancel button.

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• Well Written Title and Summary of the PR
• Label the PR as needed. "release-note/ignore-for-release, release-note/new-feature, release-note/update, release-note/enhancement, release-note/community, release-note/breaking-change, release-note/docs, release-note/infra, release-note/deprecation"
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.22%. Comparing base (c8c11b4) to head (d7d39b8).
Report is 249 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main   #20810       +/-   ##
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+ Coverage   45.36%   66.22%   +20.85%     
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  Files         244     1045      +801     
  Lines       13333   113501   +100168     
  Branches     2719     2845      +126     
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+ Hits         6049    75167    +69118     
- Misses       6983    34227    +27244     
- Partials      301     4107     +3806     

Flag	Coverage Δ
unittests	66.22% <ø> (+20.85%)	⬆️

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see 1287 files with indirect coverage changes

[stonezdj]

The CONFIG_OVERRIDE_JSON disabled the edit of all user configurations, we can't just update storage_per_project only. The principle is just lets the backend error popup to the user.

[hpoettker]

If CONFIG_OVERRIDE_JSON is set, then all fields in the tab "Administration -> Configuration" are visible but disabled. The PR is intended to mirror that behavior for the default quota.

[hpoettker]

I've rebased the change on the current main branch.

I still think it's a straight-forward fix for a very confusing issue in the UI. It brings the same solution as applied for many settings in the tab "Administration -> Configuration" to the attribute "default quota space per project".