fix: revert native typescript mocha tests

[ddelgrosso1]

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Fixes #<issue_number_goes_here> 🦕

[ddelgrosso1]

Moving back to a single require (no native typescript unit tests) in order to fix #1934. It appears that doing a dynamic import is not supported out of the box by esbuild (https://esbuild.github.io/api/#non-analyzable-imports).