fix: calling `preRegisterExternalExtensions` should be added to ext list

[ghiscoding]

• calling preRegisterExternalExtensions should be added to the extensionList array so that it will later be dispose off when looping through the array when it is time to dispose each extension

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Codecov Report

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

Project coverage is 99.8%. Comparing base (3fcc1f6) to head (0af5d59). Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1647 +/- ## ======================================== + Coverage 99.8% 99.8% +0.1% ======================================== Files 199 199 Lines 21872 21874 +2 Branches 7036 7037 +1 ======================================== + Hits 21809 21811 +2 Misses 63 63 ```

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