Hotfix import of AzureMLOnBehalfOfCredential to only credential-less datastore scenario. #19002

All 331 tests pass, 15 skipped in 1h 35m 25s

346 tests ±0 331 ✅ ±0 1h 35m 25s ⏱️ + 14m 34s
6 suites ±0 15 💤 ±0
6 files ±0 0 ❌ ±0

Results for commit 928fb71. ± Comparison against earlier commit 948250d.