Annotate optional interval query filters for type checking

Signed-off-by: Iurie Virlan <38211890+IuraHD@users.noreply.github.com>

Author: IuraHD

sqlmesh/core/state_sync/db/interval.py

@@ -277,7 +277,7 @@ def _get_snapshot_intervals(
             t.Tuple[str, str, t.Optional[str], t.Optional[str]], SnapshotIntervals
         ] = {}
 
-        filters = (
+        filters: t.List[t.Optional[exp.Condition]] = (
             list(
                 snapshot_name_version_filter(
                     self.engine_adapter,