Set up a daily Jenkins job that tries to merge upstream torbrowser-launcher's master branch into our own one

Originally created by @intrigeri on #8854 (Redmine)

… and have the ones of us who volunteered to maintain our AppArmor profile patch be notified on failure.

Parent Task: tails/sysadmin#8852

Related issues

• Related to tails/tails#10582
• Blocked by tails/sysadmin#8853