[PUI] SSO improvments

[matmair]

This addresses various ux issues/bugs in the SSO implementation in PUI.

Fixes #7972

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[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 20 lines in your changes missing coverage. Please review.

Project coverage is 83.12%. Comparing base (13440a6) to head (c54b647).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
...rc/backend/InvenTree/InvenTree/social_auth_urls.py	28.00%	18 Missing ⚠️
src/frontend/src/components/buttons/SSOButton.tsx	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8527      +/-   ##
==========================================
- Coverage   84.61%   83.12%   -1.49%     
==========================================
  Files        1178     1178              
  Lines       53584    55135    +1551     
  Branches     2026     2027       +1     
==========================================
+ Hits        45340    45833     +493     
- Misses       7722     8790    +1068     
+ Partials      522      512      -10     

Flag	Coverage Δ
backend	85.94% <35.71%> (-0.02%)	⬇️
pui	68.68% <0.00%> (-0.59%)	⬇️

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[matmair]

@SchrodingersGat @wolflu05 this now works but is not very beautiful; is this changeset ok or should we (I) search for a different solution?

[SchrodingersGat]

@matmair can you please provide a simple overview of what the issue was that you are fixing here? I understand the frontend fix (hiding the buttons if invalid) but what about the backend changes?

[SchrodingersGat]

@matmair any comments on the changes in social_auth_urls.py?

[matmair]

The current arrangement of URL definitions leads to errors in the discovery of the OIDC endpoints, the new one fixes that.