fix: Use correct account when creating Console URLs in the case of cross-account monitoring (#322)

Cross account dashboards have been added in #311, but I noticed that the URLs would try to open the AWS Console in the wrong account.

This PR fixes that.

---

_By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license_

Author: edisongustavo

lib/facade/MonitoringFacade.ts

@@ -192,8 +192,8 @@ export class MonitoringFacade extends MonitoringScope {
 
   createAwsConsoleUrlFactory(): AwsConsoleUrlFactory {
     const stack = Stack.of(this);
-    const awsAccountId = stack.account;
-    const awsAccountRegion = stack.region;
+    const awsAccountId = this.metricFactoryDefaults.account ?? stack.account;
+    const awsAccountRegion = this.metricFactoryDefaults.region ?? stack.region;
     return new AwsConsoleUrlFactory({ awsAccountRegion, awsAccountId });
   }