[WIP] BIA/RIAv2 e2e tests

[sseago]

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Please add a summary of your change

adds end-to-end tests for BackupItemActionv2/RestoreItemActionv2

Does your change fix a particular issue?

Fixes ##5970

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[weshayutin]

@kaovilai @sseago perhaps the e2e tests are now using /v2 api's and this isolated test is not really needed?

[sseago]

@weshayutin so before Velero started using the new V2 methods for CSI snapshots, this would have definitely still been desirable, but now that we've done this, any e2e test that uses CSI snapshots for backup/restore should end up testing these APIs, so it's definitely a lower priority. Is it low enough to say "no need to bother ever"? -- not sure, but maybe.

[sseago]

I'm closing this now. Since Velero 1.12, the CSI plugin uses these new v2 API calls, so any e2e tests which use CSI snapshots or data mover also test the new plugin API calls. This PR was originally started before we had any v2 plugins in use in Velero proper.

There still may be value in this, but it's a low priority now, as the regular e2e suite already exercises these API calls.