No need to compare result from GDAL contour alg -- we already have lots of tests covering the creation

of the matching GDAL command, and we can trust that GDAL will generate contours correctly

Avoids fragility in the test when underlying GDAL contour algorithm/logic changes

python/plugins/processing/tests/testdata/gdal_algorithm_raster_tests.yaml

@@ -111,7 +111,6 @@ tests:
       BAND: 1
       CREATE_3D: false
       FIELD_NAME: ELEV
-      CREATE_3D: true
       IGNORE_NODATA: false
       INPUT:
         name: dem.tif
@@ -123,6 +122,7 @@ tests:
       OUTPUT:
         name: expected/gdal/contour.gml
         type: vector
+        compare: False
 
   - algorithm: gdal:extractprojection
     name: Extract Projection (extractprojection)