Release process: drop dependency on parallel_collect_IUKs

See merge request tails/tails!267

Debug info is only useful when working on that script or to debug failures.
Let's use a terser output in the default case.

The only reason why we needed parallel_collect_IUKs so far was so that
bin/copy-iuks-to-rsync-server-and-verify, which is run by the RM during the
release process, can fetch every IUK built by Jenkins from a single place.

But parallel_collect_IUKs is painfully slow (tails/sysadmin#17744).

So let's instead teach bin/copy-iuks-to-rsync-server-and-verify how to locate
the IUKs it needs under
https://nightly.tails.boum.org/build_IUKs/configurations/ and download them from
there on rsync.lizard.

Allow users to change persisted admin password option

Closes #18018

See merge request tails/tails!266

segfault authored Nov 21, 2020 and intrigeri committed Nov 23, 2020

refs: #18018

This reverts commit e0112fc0.

No commit message

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Follow-up on edbc621f.

Document python-gitlab setup needed for generate-changelog and generate-report

See merge request tails/tails!258

At least for now, we only need 2.4.0, and it installs fine on Buster.
Once Bullseye is out, we may not need whatever newer version will
be in testing at that time, and it may or may not install on Buster.

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Translation: Tails/wiki/src/news/version_4.13.*.po
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