[TASK] runTests.sh: composer & yarn caches in .cache/ dir

Composer and yarn caches are now stored to .cache/
directory within the checkout when using runTests.sh
suites like -s composerInstall or -s unitJavascript.

This reduces complexity in the container setup, drops
possible side effects from other projects, and simplifies
caching in CI.

Resolves: #93363
Releases: master, 10.4, 9.5
Change-Id: I5f81459e3cc8c6df16438e27a88808a1823e29cb
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/67529


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Simon Gilli <typo3@gilbertsoft.org>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Simon Gilli <typo3@gilbertsoft.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>