CloudWatch: Make sure MatchExact flag gets the right value (#42621)

* use value prop instead of depracted checked prop

* make sure props are not changed for all tests

public/app/plugins/datasource/cloudwatch/components/MetricStatEditor/MetricStatEditor.test.tsx

@@ -87,4 +87,16 @@ describe('MetricStatEditor', () => {
       expect(screen.queryByText('Match exact')).toBeNull();
     });
   });
+
+  describe('match exact', () => {
+    it('should be checked when value is true', () => {
+      render(<MetricStatEditor {...props} disableExpressions={false} />);
+      expect(screen.getByLabelText('Match exact - optional')).toBeChecked();
+    });
+
+    it('should be unchecked when value is false', () => {
+      render(<MetricStatEditor {...props} query={{ ...props.query, matchExact: false }} disableExpressions={false} />);
+      expect(screen.getByLabelText('Match exact - optional')).not.toBeChecked();
+    });
+  });
 });

public/app/plugins/datasource/cloudwatch/components/MetricStatEditor/MetricStatEditor.tsx

@@ -109,7 +109,8 @@ export function MetricStatEditor({
             tooltip="Only show metrics that exactly match all defined dimension names."
           >
             <Switch
-              checked={!!query.matchExact}
+              id="cloudwatch-match-exact"
+              value={!!query.matchExact}
               onChange={(e) => {
                 onQueryChange({
                   ...query,