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 button 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 92.74%. Comparing base (26a08fc) to head (35207cf).

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   92.70%   92.74%   +0.04%     
==========================================
  Files         785      785              
  Lines       39580    39586       +6     
==========================================
+ Hits        36692    36716      +24     
+ Misses       2888     2870      -18     

Flag	Coverage Δ
e2e	48.55% <33.33%> (+0.08%)	⬆️
integration	24.54% <0.00%> (-0.01%)	⬇️
unit	90.42% <33.33%> (-0.01%)	⬇️

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