Merge lp://staging/~jelmer/brz/launchpad-nested into lp://staging/brz/3.3

Thanks Jelmer, that's going to be make easier some of our work on Lunar!

The attempt to merge lp:~jelmer/brz/launchpad-nested into lp:brz/3.3 failed. Command exited with 1.
Below is the output from the failed tests.

Collecting setuptools-gettext
  Downloading setuptools_gettext-0.1.3-py3-none-any.whl (10 kB)
Requirement already satisfied: setuptools>=46.1 in ./lib/python3.11/site-packages (from setuptools-gettext) (66.1.1)
Installing collected packages: setuptools-gettext
Successfully installed setuptools-gettext-0.1.3
Obtaining file:///tmp/tarmac/branch.wk5knryk
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Checking if build backend supports build_editable: started
  Checking if build backend supports build_editable: finished with status 'done'
  Getting requirements to build editable: started
  Getting requirements to build editable: finished with status 'done'
  Installing backend dependencies: started
  Installing backend dependencies: finished with status 'done'
  Preparing editable metadata (pyproject.toml): started
  Preparing editable metadata (pyproject.toml): finished with status 'done'
Requirement already satisfied: configobj in /usr/lib/python3/dist-packages (from breezy==3.3.3.dev0) (5.0.8)
Requirement already satisfied: fastbencode in /usr/lib/python3/dist-packages (from breezy==3.3.3.dev0) (0.2)
Requirement already satisfied: patiencediff in /usr/lib/python3/dist-packages (from breezy==3.3.3.dev0) (0.2.13)
Requirement already satisfied: merge3 in /usr/lib/python3/dist-packages (from breezy==3.3.3.dev0) (0.0.8)
Requirement already satisfied: dulwich>=0.21.2 in /usr/lib/python3/dist-packages (from breezy==3.3.3.dev0) (0.21.2)
Requirement already satisfied: urllib3>=1.24.1 in /usr/lib/python3/dist-packages (from breezy==3.3.3.dev0) (1.26.12)
Requirement already satisfied: pyyaml in /usr/lib/python3/dist-packages (from breezy==3.3.3.dev0) (6.0)
Collecting testtools
  Downloading testtools-2.6.0-py3-none-any.whl (182 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 182.2/182.2 kB 6.0 MB/s eta 0:00:00
Collecting testscenarios
  Downloading testscenarios-0.5.0-py2.py3-none-any.whl (21 kB)
Collecting python-subunit
  Downloading python_subunit-1.4.2-py3-none-any.whl (106 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 106.8/106.8 kB 5.9 MB/s eta 0:00:00
Requirement already satisfied: flake8 in /usr/lib/python3/dist-packages (from breezy==3.3.3.dev0) (5.0.4)
Collecting cython>=0.29
  Using cached Cython-0.29.33-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_24_x86_64.whl (1.9 MB)
Collecting docutils
  Downloading docutils-0.19-py3-none-any.whl (570 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 570.5/570.5 kB 9.6 MB/s eta 0:00:00
Requirement already satisfied: setuptools in ./lib/python3.11/site-packages (from breezy==3.3.3.dev0) (66.1.1)
Collecting sphinx
  Downloading sphinx-6.1.3-py3-none-any.whl (3.0 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 3.0/3.0 MB 10.7 MB/s eta 0:00:00
Collecting sphinx-epytext
  Downloading sphinx-epytext-0.0.4.tar.gz (3.6 kB)
  Preparing metadata (setup.py): started
  Preparing metadata (setup.py): finished with status 'done'
Collecting fastimport
  Downloading fastimport-0.9.14.tar.gz (41 kB...