Refactor: split PanelQueryRunner into runner and state (#16685)

* check for running

* split out panel state

* adding test file

* remove bad test

public/test/mocks/datasource_srv.ts

@@ -0,0 +1,40 @@
+import { DataSourceApi, DataQueryRequest, DataQueryResponse } from '@grafana/ui';
+
+export class DatasourceSrvMock {
+  constructor(private defaultDS: DataSourceApi, private datasources: { [name: string]: DataSourceApi }) {
+    //
+  }
+
+  get(name?: string): Promise<DataSourceApi> {
+    if (!name) {
+      return Promise.resolve(this.defaultDS);
+    }
+    const ds = this.datasources[name];
+    if (ds) {
+      return Promise.resolve(ds);
+    }
+    return Promise.reject('Unknown Datasource: ' + name);
+  }
+}
+
+export class MockDataSourceApi implements DataSourceApi {
+  name: string;
+
+  result: DataQueryResponse = { data: [] };
+  queryResolver: Promise<DataQueryResponse>;
+
+  constructor(DataQueryResponse, name?: string) {
+    this.name = name ? name : 'MockDataSourceApi';
+  }
+
+  query(request: DataQueryRequest): Promise<DataQueryResponse> {
+    if (this.queryResolver) {
+      return this.queryResolver;
+    }
+    return Promise.resolve(this.result);
+  }
+
+  testDatasource() {
+    return Promise.resolve();
+  }
+}