Fix the 'printf: non-constant format string in call to fmt.Errorf (govet)' lint errors

[tenzen-y]

I fixed lint errors as we can see in https://github.com/kubeflow/mpi-operator/actions/runs/11353824606/job/31579702079, and I removed the --new-from-rev=origin/master option from golangci-lint so that we can avoid the master branch error.

pkg/controller/mpi_job_controller.go:886:26: printf: non-constant format string in call to fmt.Errorf (govet)
                return nil, fmt.Errorf(msg)
                                       ^

[tenzen-y]

/assign @alculquicondor @terrytangyuan

[terrytangyuan]

This is great!

/lgtm
/approve

[google-oss-prow]

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