Detect if robot is blocked

[andchiind]

Describe the new feature you would like to see
Isar-exr should be able to report the Blocked robot status.

Describe the solution you'd like
Since 'failures' in MissionExecutionType is deprecated, we may need to rely on MissionExecutionStatusEnum.PAUSED to detect if the robot is stuck. This is not ideal however, as it is less precise and we may not know the reason why the mission is not running.

How will this feature affect the current Threat Model?
N/A

[tsundvoll]

Related to #122

[aeshub]

This issue has automatically been marked as stale as there has been no activity for 60 days. Remove stale label or comment or this will be closed in 7 days.