Fix dependencies for Ignition robot sim package

[luca-della-vedova]

Bug fix

Fixed bug

The rmf_robot_sim_ignition_plugins package had the leftover hack to make Ignition Edifice a non-mandatory dependency and silently skip compilation if it was not installed. Basically does the same as #31

[codecov]

Codecov Report

Merging #45 (eea3a7c) into main (0f44ea4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##            main     #45      +/-   ##
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  Coverage   0.00%   0.00%              
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  Files        270     138     -132     
  Lines      25615   12873   -12742     
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+ Misses     25615   12873   -12742     

Flag	Coverage Δ
tests	0.00% <ø> (ø)

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Impacted Files	Coverage Δ
...ation/rmf_robot_sim_common/src/ingestor_common.cpp
...ation/rmf_building_sim_gazebo_plugins/src/lift.cpp
...robot_sim_gazebo_plugins/src/TeleportDispenser.cpp
...m_ignition_plugins/src/LightTuning/LightTuning.cpp
...ion/rmf_robot_sim_ignition_plugins/src/slotcar.cpp
...obot_sim_ignition_plugins/src/TeleportIngestor.cpp
...ion/rmf_robot_sim_ignition_plugins/src/slotcar.cpp
..._sim_common/include/rmf_robot_sim_common/utils.hpp
..._sim_common/include/rmf_robot_sim_common/utils.hpp
..._robot_sim_gazebo_plugins/src/TeleportIngestor.cpp
... and 386 more