`pathing_manager` set map callback should not dereference the value

[griswaldbrooks]

Need

In order to allow the unhappy path lambdas to have their natural return types
As a pathing manager
I want to pass in the assignment to the success branch rather than dereferencing.

Acceptance Criteria

Scenario: set map callback in pathing manager should set response in a lambda
GIVEN set map callback in pathing manager is running
WHEN the happy path succeeds
THEN the response message should be set in a lambda given to and_then
AND the unhappy path should have return paths that don't force a SetMap::Response when then don't need it.

Tasks

• Refactor the below lines

Notes

pathing_manager set map callback should not dereference the expected
https://github.com/PickNikRobotics/ros_testing_templates/blob/ros2/functional_programming_tests/src/pathing_manager.cpp#L52-L57

This forces the or_else clauses to have a particular return type, which doesn't make sense in context.
References: