Rudder

We should define a dedicated bundle to save the current GM index call:

  methods:
    "Variable string_context_${report_data.directive_id}_0" usebundle => _method_reporting_context("Variable string", "cat");
                                                         ^
                                                         |
                                                current GM index call

This way, we could use this index, concatenated with the directive id to make GM/promiser re-usable by adding comments, ifvarclass, etc...
based on: directive_id_index

In the same fashion suggested in a mix of: 15783 and 16078.
It solves both issues.