Allow switching VM power state during restore

[alromeros]

What this PR does / why we need it:

This Pull Request enhances the behavior of VirtualMachine restores by introducing a new label:

"velero.kubevirt.io/restore-run-strategy"

This label can be added to the restore resource to explicitly control the power state of the VirtualMachine during the restore process. The VirtualMachine's state is backed up as it exists at the time of backup, but these labels allow you to override the default behavior and define the desired RunStrategy at restore time.

Which issue(s) this PR fixes:
Fixes # #294

Special notes for your reviewer:

There's some overlapping code with #304 but conflicts will be easy to solve.

Release note:

Allow switching VM run strategy during restore 

[mhenriks]

Would it be better to have a single label that maps to the VM runStrategy?

[alromeros]

Would it be better to have a single label that maps to the VM runStrategy?

That's so much better, thanks for the suggestion. Will address it on Monday.

[alromeros]

/test pull-kvp-functional-test

[mhenriks]

/approve

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mhenriks

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[alromeros]

/cherrypick release-v0.7

[kubevirt-bot]

@alromeros: #306 failed to apply on top of branch "release-v0.7":

Applying: Allow specifying VM RunStrategy before restore
Using index info to reconstruct a base tree...
M	pkg/plugin/vm_backup_item_action.go
M	pkg/plugin/vm_restore_item_action.go
M	pkg/plugin/vm_restore_item_action_test.go
M	pkg/plugin/vmi_backup_item_action.go
M	pkg/util/util.go
Falling back to patching base and 3-way merge...
Auto-merging pkg/util/util.go
CONFLICT (content): Merge conflict in pkg/util/util.go
Auto-merging pkg/plugin/vmi_backup_item_action.go
CONFLICT (content): Merge conflict in pkg/plugin/vmi_backup_item_action.go
Auto-merging pkg/plugin/vm_restore_item_action_test.go
Auto-merging pkg/plugin/vm_restore_item_action.go
CONFLICT (content): Merge conflict in pkg/plugin/vm_restore_item_action.go
Auto-merging pkg/plugin/vm_backup_item_action.go
CONFLICT (content): Merge conflict in pkg/plugin/vm_backup_item_action.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config advice.mergeConflict false"
Patch failed at 0001 Allow specifying VM RunStrategy before restore

In response to this:

/cherrypick release-v0.7

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-sigs/prow repository.

[alromeros]

Trying again after backporting previous PR
/cherrypick release-v0.7

[kubevirt-bot]

@alromeros: #306 failed to apply on top of branch "release-v0.7":

Applying: Allow specifying VM RunStrategy before restore
Using index info to reconstruct a base tree...
M	pkg/plugin/vm_backup_item_action.go
M	pkg/plugin/vm_restore_item_action.go
M	pkg/plugin/vm_restore_item_action_test.go
M	pkg/plugin/vmi_backup_item_action.go
M	pkg/util/util.go
Falling back to patching base and 3-way merge...
Auto-merging pkg/util/util.go
CONFLICT (content): Merge conflict in pkg/util/util.go
Auto-merging pkg/plugin/vmi_backup_item_action.go
Auto-merging pkg/plugin/vm_restore_item_action_test.go
Auto-merging pkg/plugin/vm_restore_item_action.go
CONFLICT (content): Merge conflict in pkg/plugin/vm_restore_item_action.go
Auto-merging pkg/plugin/vm_backup_item_action.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config advice.mergeConflict false"
Patch failed at 0001 Allow specifying VM RunStrategy before restore

In response to this:

Trying again after backporting previous PR
/cherrypick release-v0.7

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-sigs/prow repository.