fix: change scale test region to westcentralus

Signed-off-by: Alex Castilio dos Santos <alexsantos@microsoft.com>

Author: alexcastilio

test/e2e/common/common.go

@@ -72,7 +72,7 @@ func (s ScaleTestInfraHandler) GetSubscriptionID() string {
 
 func (s ScaleTestInfraHandler) GetLocation() string {
 	if s.location == "" {
-		return "westus2"
+		return "westcentralus"
 	}
 	return s.location
 }