Test suite: Log when video capture is started/ended

See merge request tails/tails!1083

Fix progress information inconsistencies when resuming an automatic upgrade download

Closes #18435

See merge request tails/tails!1071

This reverts commit c4fda5ac,
which actually does not fix the problem.

I need this output for a script which replays videos along with the
corresponding logs from the debug.log.

Thanks in advance!

We don't install anything from there anymore since we switched to installing the
kernel from sid, so our tagged APT snapshot ends up with no bullseye-backports
suite, which breaks APT at build time.

Upgrade Tor Browser to 12.0.4-build2

Closes #19450

See merge request !1082

Fix root exporting unsafe env

Closes #19464

See merge request !1067

This reverts commit fd831a7f.

It's not needed, and may add new failure modes