chore(gatsby): convert babel-loaders to typescript

[Kornil]

Convert babel-loaders to TS.

Related Issues

https://github.com/gatsbyjs/gatsby/issues/21995

[Kornil]

Thanks for the import changes @LekoArts I was not sure how to proceed since it was dynamically imported. I checked the tests and they still seem unrelated e2e tests.

[imjoshin]

Thanks for the import changes @LekoArts I was not sure how to proceed since it was dynamically imported. I checked the tests and they still seem unrelated e2e tests.

We have a few tests that are notoriously flaky that we're trying to resolve. I think they're all unrelated... I kicked them off again.

Thank you for your contribution 💜

[Kornil]

I'm quite unlucky with these tests, I've checked them again to be safe, mostly remote-file.js that seem to be a common one across all my PRs (unrelated) and something from gatsby-script that seem unrelated as well.

[imjoshin]

@Kornil thanks again for going through the rebase. We appreciate all that you do!