code: function toStageQualifiedStreamName(unqualifiedStreamName, stage, context) {
    return _toStageQualifiedName(unqualifiedStreamName, stage, settingNames.injectStageIntoStreamName, context);
  }
docs: ===================================================================================================================== Stream name qualification ===================================================================================================================== 
  Converts the given unqualified stream name (if non-blank) into a stage-qualified stream name by injecting the given
  stage into it (if an injectStageIntoStreamName function is configured); otherwise returns the given stream name.
  
  This function uses the configured injectStageIntoStreamName function (if any) on the given context to determine its
  actual behaviour.
  
  @param {string} unqualifiedStreamName - the unqualified name of the stream
  @param {string} stage - the stage to inject
  @param {StageHandling|Object} context - the context to use with stage handling settings and logging functionality
  @returns {string} a stage-qualified stream name (or the given stream name)