refactor: remove unused ColumnType and inspect-columns files; update migration job to use separate table analyzers for source and target databases

internal/app/etl/table_analyzers/mssql.go

@@ -36,6 +36,7 @@ LEFT JOIN sys.types bt ON t.is_user_defined = 1 AND bt.user_type_id = t.system_t
 JOIN sys.tables st ON c.object_id = st.object_id
 JOIN sys.schemas s ON st.schema_id = s.schema_id
 WHERE s.name = @schema AND st.name = @table
+  AND c.name NOT LIKE 'graph_id%'
 ORDER BY c.column_id;`
 
 type rawColumnMssql struct {