Enable adding and removing SSO config from web

[fiskus]

Description

Enable not only editing but also adding and removing the SSO config from Admin UI.

TODO

• Changelog entry (skip if change is not significant to end users, e.g. docs only)

[codecov]

Codecov Report

Attention: Patch coverage is 3.70370% with 52 lines in your changes missing coverage. Please review.

Project coverage is 38.45%. Comparing base (ec1091f) to head (dc6976d).
Report is 2 commits behind head on master.

Files	Patch %	Lines
...g/app/containers/Admin/UsersAndRoles/SsoConfig.tsx	0.00%	44 Missing ⚠️
...talog/app/containers/Admin/UsersAndRoles/Roles.tsx	0.00%	5 Missing ⚠️
catalog/app/utils/GraphQL/Provider.tsx	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4097      +/-   ##
==========================================
- Coverage   38.47%   38.45%   -0.03%     
==========================================
  Files         723      723              
  Lines       33219    33242      +23     
  Branches     4879     4888       +9     
==========================================
  Hits        12782    12782              
- Misses      19813    19836      +23     
  Partials      624      624              

Flag	Coverage Δ
api-python	90.85% <ø> (ø)
catalog	11.44% <3.70%> (-0.02%)	⬇️
lambda	87.97% <ø> (ø)

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[nl0]

lgtm.
i'd also add an option to remove/reset the sso config (not sure if emptying the text field is a good enough ux), tho that seems out of scope

[fiskus]

Emptying the text field won't work actually, because the value is "required" now

[fiskus]

Deletion accompanied by #4098

[fiskus]

Deployed to https://sso.dev.quilttest.com/admin

[nl0]

lgtm, tho i feel like we need a confirmation dialog for the deletion