sources: prevent deletion of built-in source

[dominic-r]

sdko/sources/no-delete-built-in

What?

This PR modifies renderToolbarSelected to disable the "Delete" button for the built-in authentik login source. While the source will reappear after a server restart, the change is intended as a precaution to prevent potential issues by blocking deletion. Furthermore, it adds a function to the SourceViewSet class to return an error when attmpting to delete the source using the API url.

Testing:

• Attempted to delete the built-in source
• Added sources normally and attempted to remove them to ensure no functionality was lost
• If the built-in source is in a multi-select with a valid source, the deletion won't proceed

Details

REPLACE ME

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Checklist

• Local tests pass (ak test authentik/)
• The code has been formatted (make lint-fix)

If an API change has been made

• The API schema has been updated (make gen-build)

If changes to the frontend have been made

• The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make website)

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[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 92.75%. Comparing base (b6cf27b) to head (9c06398).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
authentik/core/api/sources.py	33.33%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12914   +/-   ##
=======================================
  Coverage   92.75%   92.75%           
=======================================
  Files         785      785           
  Lines       39580    39586    +6     
=======================================
+ Hits        36711    36719    +8     
+ Misses       2869     2867    -2     

Flag	Coverage Δ
e2e	48.51% <33.33%> (+0.01%)	⬆️
integration	24.54% <0.00%> (-0.01%)	⬇️
unit	90.42% <33.33%> (-0.02%)	⬇️

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[dominic-r]

Hi @BeryJu. Sorry to bother. Do you think you could take a look at this when you have a second? Thanks