Warn instead of error when col description provided for non-existent col

Author: treysp

sqlmesh/core/model/meta.py

@@ -249,7 +249,9 @@ def _column_descriptions_validator(
         if columns_to_types:
             for column_name in col_descriptions:
                 if column_name not in columns_to_types:
-                    raise ConfigError(
+                    from sqlmesh.core.console import get_console
+
+                    get_console().log_warning(
                         f"In model '{info.data['name']}', a description is provided for column '{column_name}' but it is not a column in the model."
                     )