[bug] (MpiJob)Init container KubectlDeliveryImage should remain the ability that it can be specified from container parameters or environment variables.

[hackerboy01]

In previous v1 MPI operator, KubectlDeliveryImage can be specified from container parameters(mpi-operator.v1/app/options/options.go). In training-operator,init container KubectlDeliveryImage should remain the ability that it can be specified from container parameters or environment variables.

[hackerboy01]

/assign @hackerboy01

[stale]

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