Remove InstanceGeneration requirements in e2e tests to mitigate new instance type flakes

[bwagner5]

Description

Observed Behavior:

• New Instance Types (m7a.*) were released which did not have ENI data associated in the VPC RC. This resulted in our e2e test to flake out. To mitigate, I added a temporary requirement that we use gen 6 or below in the affected tests. That requirement should be removed in the e2e tests once the VPC RC has been updated and deployed.

Tests Affected:

1. should provision a node using the Ubuntu family
2. Windows AMIFamilies
3. should support well-known labels for windows-build version

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