[release-1.6] issue-639: Add labels from command line option to filestore backup resource

[bharath-b-rh]

This is a manual cherry-pick of #640

NONE

The automated cherry-pick #888 had merge conflicts, hence created a manual cherry-pick after rebase.

/assign @leiyiz

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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/lifecycle stale

[bharath-b-rh]

/remove-lifecycle stale