fix(gradulal): do not get compaction from default

Test keyspace should be created with default compaction strategy as
in all performance tests.

performance_regression_gradual_grow_throughput.py

@@ -115,9 +115,8 @@ def _base_test_workflow(self, workload: Workload, test_name):
         num_loaders = len(self.loaders.nodes)
         self.run_fstrim_on_all_db_nodes()
         # run a write workload as a preparation
-        compaction_strategy = self.params.get('compaction_strategy')
         if workload.preload_data:
-            self.preload_data(compaction_strategy=compaction_strategy)
+            self.preload_data()
             self.wait_no_compactions_running(n=400, sleep_time=120)
             self.run_fstrim_on_all_db_nodes()