[TASK] Remove dummy files from ext:extbase

Change-Id: I2627bcbbbc98caec6e63fd2fcea52a380c3c21a0
Resolves: #47830
Related: #47756
Releases: 6.2
Reviewed-on: https://review.typo3.org/20416
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring