[oadp-1.2] OADP-1075 Add annotation to exclude build pod volumes during backup

[openshift-cherrypick-robot]

This is an automated cherry-pick of #171

/assign kaovilai

[openshift-ci[bot]]

@openshift-cherrypick-robot: all tests passed!

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[kaovilai]

one more lgtm from someone else please :D

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kaovilai, openshift-cherrypick-robot, sseago

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/openshift/openshift-velero-plugin/blob/oadp-1.2/OWNERS)~~ [kaovilai,sseago] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[kaovilai]

/cherry-pick oadp-1.1

[openshift-cherrypick-robot]

@kaovilai: #189 failed to apply on top of branch "oadp-1.1":

Applying: Add annotation to exclude build pod volumes during backup
.git/rebase-apply/patch:423: trailing whitespace.
    buildPod = corev1API.Pod{   
warning: 1 line adds whitespace errors.
Using index info to reconstruct a base tree...
M   go.mod
M   go.sum
M   velero-plugins/main.go
Falling back to patching base and 3-way merge...
Auto-merging velero-plugins/main.go
Auto-merging go.sum
CONFLICT (content): Merge conflict in go.sum
Auto-merging go.mod
CONFLICT (content): Merge conflict in go.mod
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Add annotation to exclude build pod volumes during backup
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to [this](https://github.com/openshift/openshift-velero-plugin/pull/189#issuecomment-1505972275): >/cherry-pick oadp-1.1 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.