Converted dev scripts to ESM modules

[KolCrooks]

I converted the dev scripts to ESM modules as talked about in #701.

[CLAassistant]

All committers have signed the CLA.

[MarcusNotheis]

Hey @KolCrooks,
could you update your branch with the latest master version (or give me write access to that branch in case there are more commits that have to be merged)? Then we can get this into our codebase.
Thanks!

EDIT: sorry, just realized that I already have write access

[MarcusNotheis]

It looks like jest serializers have to be in cjs format, so could you please revert the changes in both serializers (marked as PR comment) and rename them to use the .cjs file extension?
Then you have to update the imports in config/jestsetup.ts to match the new .cjs file extension:

import contentLoaderSerializer from '@shared/tests/serializer/content-loader-serializer.cjs';
import jssSerializer from '@shared/tests/serializer/jss-snapshot-serializer.cjs';

Other than that everything looks good and we can merge this PR as soon as all CI jobs are passing.

Thanks!

[coveralls]

Coverage remained the same at 65.448% when pulling 6f74bfd on KolCrooks:ESMDevScripts into 45a6d8f on SAP:master.

[KolCrooks]

@MarcusNotheis I'm sorry that I haven't been able to work on this / not giving a heads up. I got hit with a ton of work and midterms from uni so It has been tough for me to find time to do things like this.

[MarcusNotheis]

Key @KolCrooks,
No worries, all good - as it was only a very little change that was pending I just added and merged it :) thanks for your work on that PR and good luck for your midterms :)

Best regards,
Marcus