fix(framework): add support for MPICH and IntelMPI implementations in MPI plugin

[yush-1018]

What this PR does / why we need it

Adds runtime support for MPICH and IntelMPI implementations in the MPI framework plugin (pkg/runtime/framework/plugins/mpi/mpi.go).

Previously, only OpenMPI was handled, causing runtime failures (MPI implementation for MPICH doesn't supported) when setting mpiImplementation to MPICH or Intel.

Fixes #4025

Checklist

• Code updated in pkg/runtime/framework/plugins/mpi/mpi.go
• Unit tests added in pkg/runtime/framework/plugins/mpi/mpi_test.go
• All tests passing

[google-oss-prow]

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