[BUGFIX] Ignore unmapped tables on non-default connections

This patch changes the behaviour when building the SchemaDiff on a
non-default connection to only fetch tables which are mapped to that
connection instead of fetching table details of all tables and
discarding the information for unmapped tables later on.

This improves the performance and avoids errors for data types
unknown to doctrine/dbal in details of unmapped tables.

Resolves: #92959
Releases: main, 11.5
Change-Id: Ia4a62d861ea0748995eb0dec4f01e9e65eb3ed46
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66949


Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>