test: inject instead of deprecated TestBed get

Additionally refactor tests and ts-ignore annotations.

src/app/_helpers/data/sample-configuration.ts

@@ -13,6 +13,7 @@
  * this program. If not, see <https://www.gnu.org/licenses/>.
  */
 import {SCAuthorizationProvider, SCBackendAggregationConfiguration, SCThingType} from '@openstapps/core';
+import {Polygon} from 'geojson';
 
 // provides sample aggregations to be used in tests or backendless development
 export const sampleAggregations: SCBackendAggregationConfiguration[] = [
@@ -90,7 +91,7 @@ export const sampleAuthConfiguration: {
     },
   };
 
-export const sampleDefaultPolygon = {
+export const sampleDefaultPolygon: Polygon = {
   "coordinates": [
     [
       [