Set connection settings and attribute map as computed

[sergiught]

🔧 Changes

If not provided, the connection_settings and attribute_map will be set to a default on OIDC and Okta connections, so we're setting this as computed and adjusting the tests.

📚 References

🔬 Testing

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

Merging #845 (4a693b5) into main (d1f827e) will increase coverage by 0.04%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #845      +/-   ##
==========================================
+ Coverage   89.89%   89.93%   +0.04%     
==========================================
  Files         101      101              
  Lines       13785    13785              
==========================================
+ Hits        12392    12398       +6     
+ Misses        989      985       -4     
+ Partials      404      402       -2     

see 1 file with indirect coverage changes