remove unused extension

`tablefunc` functions are not currently used, and this extension is not
available in the Azure Database for PostgreSQL - Flexible Server
(PostgreSQL v13), so we should be able to safely avoid the use of this
extension altogether.

api/apps/geoprocessing/src/migrations/geoprocessing/1611221157285-InitialGeoDBSetup.ts

@@ -6,7 +6,6 @@ export class InitialGeoDBSetup1611221157285 implements MigrationInterface {
     // Only CREATEDB privilege required in 13+ rather than SUPERUSER (ht @agnessa)
     if (await PostgreSQLUtils.version13Plus()) {
       await queryRunner.query(`
-    CREATE EXTENSION IF NOT EXISTS tablefunc;
     CREATE EXTENSION IF NOT EXISTS plpgsql;
     CREATE EXTENSION IF NOT EXISTS postgis;
     CREATE EXTENSION IF NOT EXISTS postgis_raster; -- OPTIONAL
@@ -201,7 +200,6 @@ export class InitialGeoDBSetup1611221157285 implements MigrationInterface {
       DROP EXTENSION postgis_raster; -- OPTIONAL
       DROP EXTENSION postgis;
       DROP EXTENSION plpgsql;
-      DROP EXTENSION tablefunc;
       `);
     }
   }