chore: remove core-js and regenerator-runtime

[bradenmacdonald]

core-js and regenerator-runtime are marked as a development dependencies (for the test suites), but the tests actually pass fine without them. I think they should just be removed.

Context: they are compatibility layers for older browsers/runtimes, and aren't needed in 2024.

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Codecov Report

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

Project coverage is 83.41%. Comparing base (751a691) to head (72b2b3c). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #702 +/- ## ======================================= Coverage 83.41% 83.41% ======================================= Files 40 40 Lines 1073 1073 Branches 197 197 ======================================= Hits 895 895 Misses 166 166 Partials 12 12 ```

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[brian-smith-tcril]

@arbrandes - I'd love to hear your thoughts on this (is there a non-obvious reason we'd need to keep these deps around?)

[bradenmacdonald]

@brian-smith-tcril @arbrandes I'm planning to hit merge on this PR tomorrow - let me know if you have any objections.

[davidjoy]

This makes sense to me. 👍

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