CBG-4993 support views in test harness with CBS 8.0 (#7872)

Co-authored-by: Copilot <[email protected]>

Author: torcolvin

base/main_test_cluster.go

@@ -232,6 +232,11 @@ func (c *tbpCluster) insertBucket(name string, quotaMB int, conflictResolution X
 	body.Set("name", name)
 	body.Set("numReplicas", strconv.Itoa(numReplicas))
 	body.Set("ramQuotaMB", fmt.Sprintf("%d", quotaMB))
+	// for GSI, use default storage backend: magma for 8.0+ or couchstore for <8.0
+	// views aren't supported with magma
+	if TestsDisableGSI() {
+		body.Set("storageBackend", "couchstore")
+	}
 	output, status, err := c.MgmtRequest(
 		http.MethodPost,
 		"/pools/default/buckets",