[TASK] Prepare SchemaMigrator towards DI

The low level service SchemaMigrator is used in
ext:install and testing-framework.
To allow DI in SchemaMigrator, testing-framework
needs a pre-patch, which needs this pre-patch in
core.

Resolves: #101669
Releases: main, 12.4
Change-Id: Ie1f7e9ece05e4fa12c0fd27c1e3f871d4870b99b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80531


Tested-by: Jasmina Lie�mann <minapokhalo+typo3@gmail.com>
Reviewed-by: Stefan B�rk <stefan@buerk.tech>
Tested-by: Stefan B�rk <stefan@buerk.tech>
Reviewed-by: Jasmina Lie�mann <minapokhalo+typo3@gmail.com>
Tested-by: core-ci <typo3@b13.com>