Set up limited email notification on automatic test failure for the initial deployment

Originally created by @anonym on #10287 (Redmine)

On 2015-10-15 (latest) our jenkins test suite deployment should have happened.

To prevent an avalanche of failure notifications that may scare contributors away, let’s limit the receivers to the test suite team (anonym and kytv) for the first week, and then reevaluate if we can carry out the intended plan of notifying the last author of each failing branch.

Parent Task: tails/sysadmin#5288

Related issues

• Related to tails/tails#10288
• Blocks tails/tails#10296
• Blocked by tails/tails#10119