Cleanup of obsolete packagesets

[Jeremy Bícha]

DMB,

Please remove the following packagesets. I have CC'd direct uploaders.

1. bzr
- Bazaar is now Breezy and is maintained in Debian instead of directly in Ubuntu
- No direct uploaders

2. mozilla
- osomon is a Core Dev
- Many of these packages don't exist in Ubuntu any more
- The minimal Firefox and Thunderbird debs are uploaded so rarely in
the development release or as SRUs that a packageset seems unnecessary
- Thunderbird is still uploaded in Jammy by the Security team who
doesn't need this packageset

3. mythbuntu
- Hasn't been an official flavor since 2016. If it came back, I
imagine its packageset would look different
- No direct uploaders
- There are some Ubuntu-specific packages here, hdhomerun-config-gui
and mythtv are 2 that stand out to me, but this isn't the right
packageset for them

4. oif
- The description is "multitouch". OIF was "Open Input Framework", a
Unity era project. The packageset no longer is coherent and has no
direct uploaders.

5. schooltool
- schooltool isn't in Ubuntu any more

6. sugar
- lfaraone is a MOTU so already has upload rights to these
- Sugar doesn't really have Ubuntu diff or interest in maintaining it
uniquely in Ubuntu compared to Debian.

7. ubuntugnome
- tracker was removed from plucky
- tracker-miners is already in the ubuntu-desktop set, which Tim & I
already have rights to.

8. ubuntuone
- These packages don't exist in Ubuntu any more

9. ubuntu-qt-packages
- Another Unity era set with no direct uploaders

10. zentyal
- zentyal-core and the others are not in Ubuntu any more

11. zope
- These packages are not in Ubuntu any more
- apt search zope has some results but all of them are synced from Debian

Cleanup, not removal
================
12. Please remove all packages from personal-fossfreedom except for
rhythmbox-plugin-alternative-toolbar because they are already in the
ubuntu-budgie set. That package isn't seeded in Ubuntu Budgie but is
in Ubuntu Desktop. fossfreedom is upstream for that package though.

Thank you,
Jeremy Bícha