[TASK] EM: Split Distributions in official and community-based packages

The output of the distributions should be handled for the introduction
package and all other packages.

As there is no distinction between official (published by the Core Team)
and community-based distributions, the check is done via the username
for now, but could be easily modified in one place.

Releases: 6.2
Resolves: #57181
Change-Id: I8f2584532dda4738c66bd27e69743bcff91bc422
Reviewed-on: https://review.typo3.org/28640
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Wouter Wolters
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn