Remove files from blocklist

[vedarshshah]

Background

We added task_runner.launch to the block list of launch files to avoid the check going over legacy code using ROS actions. This change needs to be reversed when task planning has been modified to remove usage of ROS actions.

We also added vectornav.launch, tasks.launch, and motion.launch to the block list since vectornav.launch results in an error when it can't find the IMU. The latter two files depend on vectornav.launch. This change needs to be reversed when the error in vectornav.launch is suppressed.

Purpose

Remove task_runner.launch, vectornav.launch, tasks.launch, and motion.launch from the block list of launch files.

[vedarshshah]

No longer necessary as robosub-ros will be archived.