Modify the StorageClass install and delete code.

* Only install and uninstall SC and VSC once for default cluster.
* Install and uninstall SC and VSC for standby cluster on migration case.
* Refactor the StorageClass and VolumeSnapshotClass YAMLs.
* Prettify the e2e_suite_test.go

Signed-off-by: Xun Jiang <xun.jiang@broadcom.com>

test/e2e/basic/api-group/enable_api_group_versions.go

@@ -100,7 +100,7 @@ func APIGroupVersionsTest() {
 			})
 			if InstallVelero {
 				By("Uninstall Velero in api group version case", func() {
-					Expect(VeleroUninstall(ctx, veleroCfg.VeleroCLI, veleroCfg.VeleroNamespace)).NotTo(HaveOccurred())
+					Expect(VeleroUninstall(ctx, veleroCfg)).NotTo(HaveOccurred())
 				})
 			}
 		}