[TASK] Exclude TypeScript sources in exports

Since the TypeScript sources don't have any impact on the behavior of the
application and are just meant for development purpose, it's safe to
exclude these files in the packaging process.

Resolves: #85674
Releases: master
Change-Id: I599433d68834a3424e5cf7d77612d2478d46510e
Reviewed-on: https://review.typo3.org/57713


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Josef Glatz <josef.glatz@typo3.org>
Tested-by: Josef Glatz <josef.glatz@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>