WIP: Get verbose information out of debootstrap to help debug ports.u.c issues

[Hyask]

This is obviously not in a mergeable state. I'm just keeping this around in case we'd like to deploy it more at scale to help IS debug ports.u.c issues.

I have a PPA with a hacked livecd-rootfs embedding a manual build of that snap, usable for testing.
PPA: https://launchpad.net/~skia/+archive/ubuntu/test-livecd-rootfs
git branch: https://git.launchpad.net/~skia/livecd-rootfs/log/?h=skia/embedded_patched_ubuntu-image

@mwhudson @utkarsh2102 do you think something like that is worth pushing forward?

1. I believe at least the dump of deboostrap.log is a good improvement.
2. But putting the whole wget verbose output in there might be a bit too much.
3. Also, it would need to be at least somehow driven by the --verbose flag.
4. Finally, that patching of debootstrap is very brittle, so proper work would include improving that as well.

cc @ben-ballot (this is more or less what's needed to get IP addresses shown in the logs when something goes wrong)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.53%. Comparing base (5ae01fe) to head (8301e28).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #290   +/-   ##
=======================================
  Coverage   93.52%   93.53%           
=======================================
  Files          19       19           
  Lines        3539     3540    +1     
=======================================
+ Hits         3310     3311    +1     
  Misses        150      150           
  Partials       79       79           

Flag	Coverage Δ
unittests	93.53% <100.00%> (+<0.01%)	⬆️

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