[TASK] Streamline Schema Parser test

* Add variable names as dataprovider set
  array keys to increase readability.
* Add dataset for double-quote parsing in
  default values.
* Add a disabled dataset for single-quote
  parsing in default values with todo to
  enable it with the bugfix.

Resolves: #103602
Releases: main, 12.4
Change-Id: Ie85deff13598238fc437f6781b6ccf8349801846
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83753


Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>