Tests Assert that HA Should not be able to set the dataStorage StorageClass

[Eforen]

Describe the bug
As this test asserts that HS cannot be able to set their storageClass but that makes no sense to me/

To Reproduce
Steps to reproduce the behavior:
Run the test

vault-helm/test/unit/server-ha-statefulset.bats

Lines 549 to 559 in 50f7439

	@test "server/ha-StatefulSet: cant set data storage" {
	cd `chart_dir`
	local actual=$(helm template \
	--show-only templates/server-statefulset.yaml \
	--set 'server.ha.enabled=true' \
	--set 'server.dataStorage.enabled=true' \
	--set 'server.dataStorage.storageClass=foo' \
	. | tee /dev/stderr |
	yq -r '.spec.volumeClaimTemplates' | tee /dev/stderr)
	[ "${actual}" = "null" ]
	}

Expected behavior
I would be able to in HA mode beable to have storage be persisted so that if they all get nocked out I don't loose all my secrets