Alerting: moving data source uid to query instead of model (#33416)

* initial commit.

* Some more improvements to the expression data source support.

* added tests to verify that time range picker and data source picker only is visible when callbacks is passed to row.

* fixing issue with filter in alerting list.

* minor refactoring.

* removed guarding code, should be fixed in  backend.

* cleaning the data query if we change to a different data source.

packages/grafana-e2e-selectors/src/selectors/components.ts

@@ -1,4 +1,7 @@
 export const Components = {
+  TimePicker: {
+    openButton: 'TimePicker Open Button',
+  },
   DataSource: {
     TestData: {
       QueryTab: {