feat: show actual teams/users in team alignment

[wamasimba]

It struck me as odd that I saw a team "unknown", whereas the users were all collected in appropriate teams, also I saw teams that did not contribute to the selected branch in the tree; this PR fixes that, by always returning the actual teams that are resulting from a team alignment analysis. The team/user names are sorted alfabetically to have a more or less predictable outcome, and by chance separate the most active users somewhat, making the colored donut charts slightly easier to analyse.

BEFORE:

When 'By user' is not selected, all teams are shown, including a artificial team 'unknown', even when a team or 'unknown' was actually not part of the analysis.

AFTER:

Only teams that occur in the analysis are shown.

Checklist for PR

• PR is only about one and only one concern
• Description contains a short title, an optional description, and the sections BEFORE and AFTER
• (A) new short test(s) show(s) that the PR is working (shown in adapted existing test)

[manfredsteyer]

Big thanks