Optional RestoreSnapshotURL should have omitempty

[rokej]

What this PR does / why we need it:
The optional field RestoreSnapshotURL does not have json omitempty. When the HypershiftDeployment controller tries to update a HostedCluster CR, the following error occurs because of missing omitempty.

spec.hostedClusterSpec.etcd.managed.storage.restoreSnapshotURL: Invalid value: "null": spec.hostedClusterSpec.etcd.managed.storage.restoreSnapshotURL in body must be of type array: "null"

Which issue(s) this PR fixes (optional, use fixes #<issue_number>(, fixes #<issue_number>, ...) format, where issue_number might be a GitHub issue, or a Jira story:
Fixes #

Checklist

• Subject and description added to both, commit and PR.
• Relevant issues have been referenced.
• This change includes docs.
• This change includes unit tests.

[openshift-ci]

@rokej: No Bugzilla bug is referenced in the title of this pull request.
To reference a bug, add 'Bug XXX:' to the title of this pull request and request another bug refresh with /bugzilla refresh.

In response to this:

Optional RestoreSnapshotURL should have omitempty

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, rokej

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[openshift-ci-robot]

/retest-required

Remaining retests: 2 against base HEAD 352e547 and 8 for PR HEAD b23ee04 in total

[openshift-ci]

@rokej: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-kubevirt-gcp-ovn	b23ee04	link	false	/test e2e-kubevirt-gcp-ovn
ci/prow/e2e-aws	b23ee04	link	true	/test e2e-aws
ci/prow/capi-provider-agent-sanity	b23ee04	link	false	/test capi-provider-agent-sanity
ci/prow/e2e-kubevirt-azure-ovn	b23ee04	link	false	/test e2e-kubevirt-azure-ovn
ci/prow/e2e-aws-metrics	b23ee04	link	false	/test e2e-aws-metrics
ci/prow/e2e-aws-all	b23ee04	link	false	/test e2e-aws-all

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[hardys]

/lgtm

Thanks for the fix - sorry I missed that!