Store automated test videos with other artifacts

Originally created by @bertagaz on #10154 (Redmine)

As discussed while designing the automated tests, storing the resulting videos is interesting to debug what failed. So we should store them as artifacts.

Storing all videos produced by the automated test suite doesn’t make much sense. We’re interested in the failing scenarios.

Parent Task: tails/sysadmin#10153

Related issues

• Has duplicate tails/tails#10156
• Blocked by tails/tails#10148