[release-7.0] Add snapshot secret reference to group snapshot controller.

[Madhu-1]

Fixes: https://github.com/kubernetes-csi/external-snapshotter/issues/834 Signed-off-by: Manish myathnal@redhat.com (cherry picked from commit e171a982681be29556ca46c06ea6378cdfe3effe)

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What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

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Does this PR introduce a user-facing change?:

Cherry-pick from PR [#1034](https://github.com/kubernetes-csi/external-snapshotter/pull/1034) Adds secret reference to volume group snapshot content.

[k8s-ci-robot]

Hi @Madhu-1. Thanks for your PR.

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[Madhu-1]

/assign @xing-yang

[xing-yang]

/ok-to-test

[Madhu-1]

@xing-yang CI passed on the PR's can you please review this one again?

[xing-yang]

/lgtm /approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Madhu-1, xing-yang

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