Test suite: Fix step "the clearnet user has not sent packets out to the Internet"

Closes #19370

See merge request tails/tails!1074

run_test_suite: Add --all-tests

See merge request tails/tails!1076

Upgrade Tor Browser to 12.0.4-build1

Closes #19450

See merge request tails/tails!1078

refs #19450

Try again when GitLab CI fails to fetch source

See merge request tails/tails!1075

As discussed during a Sysadmin/FT sunc, this is a low-hanging-fruit
attempt to deal with errors when cloning the source repository.

refs sysadmin#11869

Remove custom window-center extension

Closes #19489

See merge request tails/tails!1072

Test suite: Fix step "Tails has no disk swap enabled"

Closes #19533

See merge request tails/tails!1073

19474 confidential symlink attack

See merge request boyska/tails!1

Currently translated at 66.6% (6 of 9 strings)

Translation: Tails/wiki/src/doc/persistent_storage/use.*.po
Translate-URL: https://translate.tails.boum.org/projects/tails/wikisrcdocpersistent_storageusepo/fr/

Currently translated at 55.5% (5 of 9 strings)

Translation: Tails/wiki/src/doc/persistent_storage/use.*.po
Translate-URL: https://translate.tails.boum.org/projects/tails/wikisrcdocpersistent_storageusepo/fr/

Currently translated at 100.0% (9 of 9 strings)

Translation: Tails/wiki/src/doc/persistent_storage/open.*.po
Translate-URL: https://translate.tails.boum.org/projects/tails/wikisrcdocpersistent_storageopenpo/fr/

Currently translated at 77.2% (17 of 22 strings)

Translation: Tails/wiki/src/doc/persistent_storage/create.*.po
Translate-URL: https://translate.tails.boum.org/projects/tails/wikisrcdocpersistent_storagecreatepo/fr/

Currently translated at 42.8% (9 of 21 strings)

Translation: Tails/wiki/src/doc/persistent_storage.*.po
Translate-URL: https://translate.tails.boum.org/projects/tails/wikisrcdocpersistent_storagepo/fr/

Currently translated at 100.0% (16 of 16 strings)

Translation: Tails/wiki/src/doc/first_steps/persistence/passphrase.*.po
Translate-URL: https://translate.tails.boum.org/projects/tails/wikisrcdocfirst_stepspersistencepassphrasepo/fr/

Currently translated at 100.0% (83 of 83 strings)

Translation: Tails/wiki/src/doc/encryption_and_privacy/veracrypt.*.po
Translate-URL: https://translate.tails.boum.org/projects/tails/wikisrcdocencryption_and_privacyveracryptpo/fr/

To make sure that the "the Unsafe Browser has not sent packets out to
the Internet" works as expected, we check that packets are sent when the
Unsafe Browser loads a web page.

The Unsafe Browser doesn't run as clearnet anymore, so we have to check
for traffic on veth-clearnet instead.

Closes #19370

Currently translated at 55.5% (5 of 9 strings)

Translation: Tails/wiki/src/doc/persistent_storage/use.*.po
Translate-URL: https://translate.tails.boum.org/projects/tails/wikisrcdocpersistent_storageusepo/fr/

Currently translated at 55.5% (5 of 9 strings)

Translation: Tails/wiki/src/doc/persistent_storage/use.*.po
Translate-URL: https://translate.tails.boum.org/projects/tails/wikisrcdocpersistent_storageusepo/fr/

Currently translated at 44.4% (4 of 9 strings)

Translation: Tails/wiki/src/doc/persistent_storage/use.*.po
Translate-URL: https://translate.tails.boum.org/projects/tails/wikisrcdocpersistent_storageusepo/fr/

Currently translated at 44.4% (4 of 9 strings)

Translation: Tails/wiki/src/doc/persistent_storage/use.*.po
Translate-URL: https://translate.tails.boum.org/projects/tails/wikisrcdocpersistent_storageusepo/fr/

Currently translated at 33.3% (3 of 9 strings)

Translation: Tails/wiki/src/doc/persistent_storage/use.*.po
Translate-URL: https://translate.tails.boum.org/projects/tails/wikisrcdocpersistent_storageusepo/fr/

Currently translated at 100.0% (83 of 83 strings)

Translation: Tails/wiki/src/doc/encryption_and_privacy/veracrypt.*.po
Translate-URL: https://translate.tails.boum.org/projects/tails/wikisrcdocencryption_and_privacyveracryptpo/fr/