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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

:exclamation: 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

```diff @@ 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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