Upgrade Cucumber on Jenkins isotesters

Originally created by @intrigeri on #17080 (Redmine)

Once we’ve done tails/sysadmin#10068 we might be able to upgrade to Cucumber 2.x from Stretch, while we’re currently running 1.3 from Jessie.

Goals:

stop running Jessie-era Cucumber on our CI
avoid confusion between what developers see locally and what our CI does (e.g. https://gitlab.tails.boum.org/tails/tails/-/issues/16150#note_12284)
fix tails/tails#16150
unblock tails/tails#10328

See tails/tails#10328 for things that might need to happen at the same time.

Finally, as part of this ticket, we should revert eccc25460099522ad26d33c93f3d70601ae63ee9.

Feature Branch: puppet-tails:cucumber2, jenkins-jobs:cucumber2

Edited May 15, 2020 by intrigeri