scoring-load-balancer Jenkins plugin is missing

tails/sysadmin#17847 removed this plugin, which we need (it was used to solve tails/sysadmin#17857).

Please:

• bring it back → puppet-tails@56d0c201e81a7c3b2511ed63d5aea98c6cfabbc8
• add it to your list of plugins we want 😄 → tails@b068a8dcac92d2784b1decb2aaed764c27ba698c
• ensure the config matches what I did when I set up that plugin: https://gitlab.tails.boum.org/tails/sysadmin/-/issues/17857#note_179089

Thanks in advance!