feat(datasource): Checkbox for always filtering main dttm in datasource (#25204)

Co-authored-by: Elizabeth Thompson <eschutho@gmail.com>

tests/integration_tests/datasets/commands_tests.py

@@ -171,6 +171,7 @@ class TestExportDatasetsCommand(SupersetTestCase):
                 },
             ],
             "normalize_columns": False,
+            "always_filter_main_dttm": False,
             "offset": 0,
             "params": None,
             "schema": get_example_default_schema(),
@@ -231,6 +232,7 @@ class TestExportDatasetsCommand(SupersetTestCase):
             "fetch_values_predicate",
             "extra",
             "normalize_columns",
+            "always_filter_main_dttm",
             "uuid",
             "metrics",
             "columns",