Backport of Add explanation about IK plugins for servo (#474) to humble

[mergify]

This is an automatic backport of pull request #474 done by Mergify.

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[tylerjw]

It looks like the version of MoveIt used by CI doesn't have this feature yet:

/home/runner/work/moveit2_tutorials/moveit2_tutorials/.work/upstream_ws/src/moveit_task_constructor/core/src/solvers/cartesian_path.cpp:62:47: error: ‘IKCostFn’ is not a member of ‘kinematics::KinematicsBase’
     62 |         p.declare<kinematics::KinematicsBase::IKCostFn>("kinematics_cost_fn", kinematics::KinematicsBase::IKCostFn(),
        |                                               ^~~~~~~~

This is because the version in the repos file does not point to a version of moveit that has this feature. Please try updating the repos file.

[vatanaksoytezer]

We should probably remove the release jobs here. We don't need to use moveit2 in upstream.repos because we are already using the latest docker image.

[tylerjw]

We should probably remove the release jobs here. We don't need to use moveit2 in upstream.repos because we are already using the latest docker image.

Do you mind creating an issue to layout what you think our strategy should be with regard to the CI here depending on moveit docker images (and therefore how we should change the current system)?