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[bot]]

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

@@           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           

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[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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