dashboard reports Git repository contains an untracked debian branch debian/bullseye

Background

After removing v2023 and bullseye from dashboard configuration, several packages report the warning "Git repository contains an untracked debian branch debian/bullseye"

Reproducibility

How often the issue is hit when repeating the steps to reproduce and changing nothing?

Put the ✅ in the most appropriate entry:

1. ✅ always
2. often, but not always
3. rarely

Impact of bug

There is lots of noise in the dashboard

Outcomes

TBD

Management data

This section is for management only, it should be the last one in the description.

/cc @em @Balasubramanian @sudarshan @wlozano

Phabricator link: https://phabricator.apertis.org/T10924