fix: scale test vm region (#2670)

# Description

Scale tests are failing due to lack of quota. This PR updates the region
to a region that has enough quota

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---

Please refer to the [CONTRIBUTING.md](../CONTRIBUTING.md) file for more
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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
 }