Remove type stability checks for AbstractDifferentiation 0.6

[codecov[bot]]

Codecov Report

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

Comparison is base (a2dcb60) 97.28% compared to head (210f8ef) 97.28%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #128 +/- ## ======================================= Coverage 97.28% 97.28% ======================================= Files 9 9 Lines 184 184 ======================================= Hits 179 179 Misses 5 5 ```

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