[TASK] Avoid class property $relationMap in TcaSchemaFactory

TcaSchemaFactory can avoid more class state:
RelationMap is only used during building and
can be hand around instead of parking it on
$this.

Resolves: #104326
Related: #104002
Related: #104322
Releases: main
Change-Id: I2ccf2b816506276a7676a6a9dc0435e8a01eb078
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85143


Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Jasmina Ließmann <minapokhalo+typo3@gmail.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Jasmina Ließmann <minapokhalo+typo3@gmail.com>
Tested-by: Oliver Bartsch <bo@cedev.de>