[CPL-16235] Fetch data by specified date columns only

Commits 2597485 and
d880663 accidentally
reverted to original tap-google-ads behaviour in which
tap fetches all reports day-by-day ONLY no matter
whether `date` column is requested in the config or not.

The tap must fetch data by months if `month` column
specified but `date` column is not.

The tap must fetch data by days if both `month` and
`date` columns are specified.

tap_google_ads/streams.py

@@ -726,7 +726,7 @@ def build_stream_metadata(self):
             # Add inclusion metadata
             if self.behavior[report_field]:
                 inclusion = "available"
-                if transformed_field_name in ({"date"} | self.automatic_keys):
+                if transformed_field_name in self.automatic_keys:
                     inclusion = "automatic"
             else:
                 inclusion = "unsupported"