Master should substitute task/order parameters for a jobs credentials key

Current Situation

• A job can be configured to be executed for a different user account with Agents in Windows environments.
  • The respective job is configured like this:

    <job credentials_key="toto">

Desired Behavior

• The credentials key should be substituted if an environment variable or task or order parameter or global JobScheduler variable is specified for its value.
  • The respective job is configured like this:

    • <job credentials_key="$VARIABLE">

    • or

      <job credentials_key="${VARIABLE}">

• The user from the JOC login can be used like this
  • The respective job is configured like this:

    <job credentials_key="${SCHEDULER_JOC_USER_ACCOUNT}">