Add an 'all-tests-passed' job to test workflows

[busma13]

To simplify which checks must pass for a PR to be mergable, we should add a job that only runs if all the other required jobs pass. Then we only need to verify that the 'all-tests-passed' job was successful.

Currently we look for the check-docker-limit-after job because it waits for all the other jobs, but there is no indication that this job has this responsibility, and it could be changed without anyone realizing.

This should be done for teraslice and all assets, then each repo's settings needs to be reviewed.