[TASK] Port remaining JavaScript unit tests to TypeScript

Helps to migrate to ES6 modules as that's just
a tsconfig setting then.

Releases: main
Resolves: #96409
Related: #96323
Change-Id: Ib897c3c2cfdb6d7ff0a88ea70ed9213b33dd2138
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72753


Tested-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Benjamin Franzke <bfr@qbus.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benjamin Franzke <bfr@qbus.de>