featuregate analyzer: use correct platform name

[stbenjam]

vsphere-ipi is now just vsphere for the platform name after the move to the variant registry.

[openshift-ci[bot]]

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[openshift-ci[bot]]

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[deads2k]

/lgtm /approve

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: deads2k, stbenjam

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[tssurya]

/tide refresh

[openshift-bot]

[ART PR BUILD NOTIFIER]

Distgit: ose-cluster-config-api This PR has been included in build ose-cluster-config-api-container-v4.18.0-202408150311.p0.g3f284e6.assembly.stream.el9. All builds following this will include this PR.