feat(operator): enforce RFC 1035 validation for TrainJob name #1348

Job	Run time
Build and Publish Images (model-initializer, cmd/initializers/model/Dockerfile, linux/amd64,linux...	2m 17s
Build and Publish Images (dataset-initializer, cmd/initializers/dataset/Dockerfile, linux/amd64,l...	2m 15s
Build and Publish Images (trainer-controller-manager, cmd/trainer-controller-manager/Dockerfile, ...	12m 3s
Build and Publish Images (torchtune-trainer, cmd/trainers/torchtune/Dockerfile, linux/amd64,linux...	27m 31s
Build and Publish Images (deepspeed-runtime, cmd/runtimes/deepspeed/Dockerfile, linux/amd64,linux...	1h 3m 5s
Build and Publish Images (mlx-runtime, cmd/runtimes/mlx/Dockerfile, linux/arm64)	59m 32s
	2h 46m 43s

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