[GCU Bug Fix/Feature Update] Cherry-pick RDMA Platform Validator PR to 202205

[isabelmsft]

What I did

Include RDMA Platform Validator PR isabelmsft@f258e2a
And improvements/edge case consideration Update PR: #2913

How I did it

How to verify it

Ensured all generic_config_updater/test_pfcwd_status.py nightly tests are passing consistently on master OSVersions with RDMA platform validator change
Manually ensured test_add_rack passes:

ADO 17747379

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