feat: add rhel8 and rhel9 to guest os list

[MindTooth]

What this PR does / why we need it:

Today we only see vsphere-vm.cpu-4.mem-16gb.os-unknown as guest OS name:

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Taken from this list: https://knowledge.broadcom.com/external/article/321876/determine-the-guest-os-from-a-vm-configu.html

Note! RHEL 9 needs compatibility profile 18 or higher.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

N/A

Special notes for your reviewer:

I also see that setting the type string is only done at discovery. IMHO, it should have been reconciled because you might scale the nodes via vSphere.

cloud-provider-vsphere/pkg/cloudprovider/vsphere/nodemanager.go

Line 367 in a7f0c5c

instanceType := fmt.Sprintf("vsphere-vm.cpu-%d.mem-%dgb.os-%s",

Release note:

[linux-foundation-easycla]

• ✅login: MindTooth / (36f10a1)

The committers listed above are authorized under a signed CLA.

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[zhanggbj]

/ok-to-test

[MindTooth]

Do you think it will be okay to add rhel10_64Guest also, now that RHEL 10 officially announced? I see that it's added to vSphere yet by VMware, but could be a future proofing.