Add _queue-status endpoint to realm server #4476

All 741 tests pass, 2 skipped in 24m 7s

    1 files ±  0     1 suites ±0 24m 7s ⏱️ + 2m 36s
743 tests +  9 741 ✔️ +  9 2 💤 ±0 0 ❌ ±0
748 runs +10 746 ✔️ +10 2 💤 ±0 0 ❌ ±0

Results for commit 908746b. ± Comparison against earlier commit 5a2d89d.