Redoing Execution Plan Comparison Editor (#19375)

* Adding code for execution plan comparison editor

* Handling floating promises and fixing a loc string

* Fixing some polygon stuff

* Fixing azdatagraph null check bug

* Adding progress notification for similar areas

* Removing some floating promises

* Fixing button enabled state

src/sql/workbench/contrib/executionPlan/common/executionPlanInput.ts

@@ -67,6 +67,9 @@ export class ExecutionPlanInput extends EditorInput {
 	}
 
 	get resource(): URI | undefined {
-		return undefined;
+		return URI.from({
+			scheme: ExecutionPlanInput.SCHEMA,
+			path: 'execution-plan'
+		});
 	}
 }