Fix: no overwrite when run launcher as worker

[kuizhiqing]

Default implementation overwrite envs NVIDIA_VISIBLE_DEVICES and NVIDIA_DRIVER_CAPABILITIES which is not work in the RunLauncherAsWorker case with GPU.

[tenzen-y]

Implementation is lgtm
Could you extend unit tests here?:

mpi-operator/pkg/controller/mpi_job_controller_test.go

Line 1195 in f92b9c7

func TestNewLauncherAndWorker(t *testing.T) {

[tenzen-y]

Thanks!

/lgtm
/assign @alculquicondor

[alculquicondor]

/approve

[google-oss-prow]

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