expose `job_variables` in `runtime.flow_run` #18128

Job	Run time
docker, python:3.9	5m 45s
Server Tests - python:3.9, postgres:14	9m 25s
docker, python:3.10	5m 41s
Server Tests - python:3.10, postgres:14	9m 20s
docker, python:3.11	5m 40s
Server Tests - python:3.11, postgres:14	8m 34s
docker, python:3.12	5m 21s
Server Tests - python:3.12, postgres:14	8m 15s
Server Tests - python:3.9, sqlite	11m 19s
Server Tests - python:3.10, sqlite	10m 56s
Server Tests - python:3.11, sqlite	10m 33s
Server Tests - python:3.12, sqlite	10m 7s
Client Tests - python:3.9, postgres:14	11m 18s
Client Tests - python:3.10, postgres:14	10m 59s
Client Tests - python:3.11, postgres:14	10m 23s
Client Tests - python:3.12, postgres:14	9m 12s
Runner and Worker Tests - python:3.9, postgres:14	2m 34s
Runner and Worker Tests - python:3.10, postgres:14	2m 9s
Runner and Worker Tests - python:3.11, postgres:14	2m 8s
Runner and Worker Tests - python:3.12, postgres:14	2m 25s
combine-coverage	34s
	2h 32m 38s

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