[REST_API_SPEC] remove invalid use of catch: param

`catch: param` is designed to catch errors generated by client-side validation logic when users don't supply valid parameters to an API request. This test though is testing the server-side validation of pipeline aggregations, and so a "param" catch is invalid. Instead we will just test for a parse_exception error type using a regex.

rest-api-spec/src/main/resources/rest-api-spec/test/ingest/10_crud.yaml

@@ -36,7 +36,7 @@
 ---
 "Test invalid config":
   - do:
-      catch: param
+      catch: /parse_exception/
       ingest.put_pipeline:
         id: "my_pipeline"
         body:  >