fit: Resolve prohibited attrs override issues

[tefra]

📒 Description

• We supported converting attrs to list when parent was a list but not the child attr, we also need to support the opposite
• In both cases we need to protect against updating prohibited attrs

🔗 What I've Done

Write a description of the steps taken to resolve the issue

💬 Comments

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🛫 Checklist

• Updated docs
• Added unit-tests
• Sample tests pass
• W3C tests pass

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.94%. Comparing base (ff01d9b) to head (ffe2bd1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #998   +/-   ##
=======================================
  Coverage   99.94%   99.94%           
=======================================
  Files         117      117           
  Lines        9169     9174    +5     
  Branches     2179     2180    +1     
=======================================
+ Hits         9164     9169    +5     
  Misses          4        4           
  Partials        1        1           

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