fix(train): allow zero-step training with bias adjustment #15780

Job	Run time
Test Python (1, 3.13)	59m 52s
Test Python (2, 3.13)	58m 47s
Test Python (4, 3.10)	59m 0s
Test Python (3, 3.13)	50m 25s
Test Python (11, 3.13)	1h 0m 11s
Test Python (5, 3.10)	56m 14s
Test Python (3, 3.10)	58m 14s
Test Python (12, 3.10)	48m 46s
Test Python (2, 3.10)	32m 42s
Test Python (6, 3.10)	59m 28s
Test Python (11, 3.10)	52m 34s
Test Python (9, 3.13)	53m 4s
Test Python (8, 3.10)	33m 7s
Test Python (8, 3.13)	52m 18s
Test Python (9, 3.10)	40m 14s
Test Python (4, 3.13)	1h 3m 5s
Test Python (1, 3.10)	1h 2m 58s
Test Python (6, 3.13)	58m 29s
Test Python (5, 3.13)	59m 30s
Test Python (7, 3.10)	52m 22s
Test Python (10, 3.10)	58m 19s
Test Python (12, 3.13)	43m 32s
Test Python (7, 3.13)	58m 18s
Test Python (10, 3.13)	49m 45s
Combine and update integration test durations (3.13)	7s
Combine and update integration test durations (3.10)	9s
Pass testing Python	5s
	21h 21m 35s

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