MTC: when using PipelinePlanner selected planner is not used

[sbstorz]

In a MTC Python script when creating a "PipelinePlanner" object, the specified planner is not used.
pipeline = core.PipelinePlanner(node, "ompl", "RRTConnect")

Behavior
The move_group just falls back to the default OMPL planner, RRTConnect.
Log output:

[IAmNotARobot.py-1] [WARN] [1769894321.310517867] [moveit_3514520371.moveit.planners.ompl.planning_context_manager]: Cannot find planning configuration for group 'arm' using planner 'RRTConnect'. Will use defaults instead.
[IAmNotARobot.py-1] [INFO] [1769894321.310961171] [moveit_3514520371.moveit.planners.ompl.model_based_planning_context]: Planner configuration 'arm' will use planner 'geometric::RRTConnect'. Additional configuration parameters will be set when the planner is constructed

Expected Behavior
The specified planner is used.

[sbstorz]

Potential Fix:
moveit/moveit_task_constructor#709