Install python3-typeguard for ISO testers

See merge request !173

Needed for updating Chutney (refs: tails!2033).

Install python3-typing-extensions for ISO testers

See merge request !172

Needed for updating Chutney (refs: tails!2033).

refs tpo/tpa/team#41945

talkback: report the correct commit

See merge request !170

In puppet-tails.git/templates/jenkins/wrap_test_suite.epp we see that
it sets the Git state to UPSTREAMJOB_GIT_COMMIT, so that commit is
what should be reported.

- mirrors@tails.net was never really used, see:
  5afbe223a524104f3bd2ca4ba21b308952078f0a

- tails-bugs@tails.net is obsolete since:
  8b1e9a24a95f20709633b61b9a40ca5d98cf7c8a

Gather stats about Torrents downloads

See merge request !169

refs tails#19275

This reverts commit 8100e967.

refs tpo/tpa/team#41958

refs tpo/tpa/team#41958

tpo/tpa/team#41958

refs tpo/tpa/tails/sysadmin#18143

refs tpo/tpa/tails/sysadmin#18143

Because IkiWiki doesn't follow dot directories when building the
website, the .well-known/funding-manifest-urls path needs to be served
in the webserver level.

See: https://gitlab.torproject.org/tpo/web/tpo/-/issues/479

Apparently, the script provided by GitLab Runner doesn't clean up as
much as it could, so let's also run Docker's own clearing command when
clearing the "Docker cache".

refs tpo/tpa/tails/sysadmin#18167

refs tpo/tpa/tails/sysadmin#18160

We'll need that to increase the amount of parallel clones in the
Gitolite server.

refs tpo/tpa/tails/sysadmin#18160

refs tpo/tpa/tails/sysadmin#18163

refs tpo/tpa/tails/sysadmin#18164

refs tails#20522