Added member oid extension for each observation #15712

All 418 tests pass, 10 skipped in 43m 24s

60 files ±0 60 suites ±0 43m 24s ⏱️ +38s
428 tests ±0 418 ✅ ±0 10 💤 ±0 0 ❌ ±0
431 runs ±0 421 ✅ ±0 10 💤 ±0 0 ❌ ±0

Results for commit 94a4472. ± Comparison against earlier commit 294d9fd.