OCPBUGS-11493: Update storage vSphere driver validation

[JoelSpeed]

We need to be able to switch between LegacyDeprecatedInTreeDriver and "" so this updates the validation to relax it so that we can do so.
I've simplified based on what I believe the intention is, allowing changing to CSIWithMigraitonDriver, but not allowing changing away from it, so once oldSelf is CSIMigration driver, self must be too

[openshift-ci]

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[JoelSpeed]

CC @jsafrane @dobsonj

[openshift-ci]

@JoelSpeed: all tests passed!

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[dobsonj]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dobsonj, JoelSpeed

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[openshift-ci-robot]

@JoelSpeed: Jira Issue OCPBUGS-11493: All pull requests linked via external trackers have merged:

Jira Issue OCPBUGS-11493 has been moved to the MODIFIED state.

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In response to this:

We need to be able to switch between LegacyDeprecatedInTreeDriver and "" so this updates the validation to relax it so that we can do so.
I've simplified based on what I believe the intention is, allowing changing to CSIWithMigraitonDriver, but not allowing changing away from it, so once oldSelf is CSIMigration driver, self must be too

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[JoelSpeed]

/cherry-pick release-4.13

[openshift-cherrypick-robot]

@JoelSpeed: new pull request created: #1437

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In response to this:

/cherry-pick release-4.13

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