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

A place to write any comments to the reviewer.

🛫 Checklist

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

[sonarcloud[bot]]

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[bot]]

Codecov Report

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

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

Additional details and impacted files

```diff @@ 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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