Update Veeam pattern name and getting started steps

[mattbator]

Based on conversation with Michael St. Jean, updating pattern display name to "OpenShift Virtualization Data Protection with Veeam Kasten"

Small update to getting started steps to use global values-kasten.yaml file instead of an override

[openshift-ci]

Hi @mattbator. Thanks for your PR.

I'm waiting for a validatedpatterns member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[mbaldessari]

This is an automated message:

You can preview this docs PR at http://497.docs-pr.validatedpatterns.io
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[mbaldessari]

/ok-to-test

[mbaldessari]

I hope I resolved the conflicts correctly, please do let me know if I botched something and thanks for the PR!