AzureMonitor: Clean namespace when changing the resource (#50311) (#50342)

(cherry picked from commit ae449cc823)

Co-authored-by: Andres Martinez Gotor <andres.martinez@grafana.com>

public/app/plugins/datasource/grafana-azure-monitor-datasource/components/MetricsQueryEditor/setQueryValue.test.ts

@@ -0,0 +1,31 @@
+import createMockQuery from '../../__mocks__/query';
+
+import { setResource } from './setQueryValue';
+
+describe('setResource', () => {
+  it('should set a resource URI', () => {
+    const q = setResource(createMockQuery(), '/new-uri');
+    expect(q.azureMonitor?.resourceUri).toEqual('/new-uri');
+  });
+
+  it('should remove clean up dependent fields', () => {
+    const q = createMockQuery();
+    expect(q.azureMonitor?.metricNamespace).not.toEqual(undefined);
+    expect(q.azureMonitor?.metricName).not.toEqual(undefined);
+    expect(q.azureMonitor?.metricDefinition).not.toEqual(undefined);
+    expect(q.azureMonitor?.aggregation).not.toEqual(undefined);
+    expect(q.azureMonitor?.metricDefinition).not.toEqual(undefined);
+    expect(q.azureMonitor?.metricDefinition).not.toEqual(undefined);
+    expect(q.azureMonitor?.timeGrain).not.toEqual('');
+    expect(q.azureMonitor?.timeGrain).not.toEqual([]);
+    const newQ = setResource(createMockQuery(), '/new-uri');
+    expect(newQ.azureMonitor).toMatchObject({
+      metricNamespace: undefined,
+      metricName: undefined,
+      aggregation: undefined,
+      metricDefinition: undefined,
+      timeGrain: '',
+      dimensionFilters: [],
+    });
+  });
+});

public/app/plugins/datasource/grafana-azure-monitor-datasource/components/MetricsQueryEditor/setQueryValue.ts

@@ -9,6 +9,7 @@ export function setResource(query: AzureMonitorQuery, resourceURI: string | unde
       metricNamespace: undefined,
       metricName: undefined,
       aggregation: undefined,
+      metricDefinition: undefined,
       timeGrain: '',
       dimensionFilters: [],
     },