[TASK] Deprecate \TYPO3\CMS\Core\Core\Bootstrap::loadExtensionTables

With the patch https://review.typo3.org/51892 we have introduced single
functions to handle loading of information correctly. We can now remove
the wrapper function and call the new ones instead.

Resolves: #80079
Releases: master
Change-Id: I0d61f0d5760ae3c61fa96dc16329365d5f4182a5
Reviewed-on: https://review.typo3.org/51918


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>