Tests

Gemma3 VisionEncoder implementation and checkpoint conversion #3751

Job	Run time
prelim	19s
tpu_image / Build and upload image (v4-8)	5m 50s
gpu_image / Build and upload image (a100-40gb-4)	20m 30s
tpu_unit_tests / run	26m 43s
tpu_integration_tests / run	1m 39s
gpu_unit_tests / run	16m 16s
gpu_integration_tests / run	32s
Clean up	9s
Notify failed build	0s
	1h 11m 58s

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