Improve identity provider forms in UI

[edlerd]

Done

• improve identity provider forms:
  • add subheadings
  • add help texts
  • improve layout
  • improve visual structure
  • add nice visual for selecting auto discovery / manual urls
• make buttons in side panels sticky on the bottom
• avoid react imports

Screenshots

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.64%. Comparing base (d2cb05f) to head (b9748ee).
Report is 45 commits behind head on main.

❗ Current head b9748ee differs from pull request most recent head a4acd46. Consider uploading reports for the commit a4acd46 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #249      +/-   ##
==========================================
+ Coverage   73.14%   74.64%   +1.50%     
==========================================
  Files          29       33       +4     
  Lines        2528     3281     +753     
==========================================
+ Hits         1849     2449     +600     
- Misses        558      691     +133     
- Partials      121      141      +20     

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