Fix#32795
If a job uses a matrix, multiple `ActionRunJobs` may have the same
`JobID`. We need to merge the outputs of these jobs to make them
available to the jobs that need them.
(cherry picked from commit 7269130d2878d51dcdf11f7081a591f85bd493e8)
Conflicts:
models/fixtures/action_run.yml
models/fixtures/action_run_job.yml
trivial context conflicts
