[BUGFIX] Initialize extension name in command requests

This patch initializes the extension name in the configuration manager
as soon as it is available during an Extbase command line request.

Resolves: #51329
Releases: 6.2, 6.1, 6.0
Change-Id: I73b0f0e7a0b20e1773c9eb92f0d2175416ce2bb1
Reviewed-on: https://review.typo3.org/24125
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring