instancetypes: Remove common-instancetypes FGs from KubeVirt and SSP

[lyarwood]

/hold
/cc @akrejcir

I think we need to wait for SSP v0.22.0 before we can land both of these changes right?

What this PR does / why we need it:

The KubeVirt FG has now GA'd with v1.4.0 and is enabled by default.

The SSP FG is now deprecated, defaults to false and can also be removed with v0.22.0.

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Release note:

NONE

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud