Describe the bug

After upgrading ros2_control from version 4.37.0 to commit 2c186d2a88e1a95c2f215b39382008db77c094fa
(which introduced handling for boolean data types), I noticed that signals defined with data_type=bool no longer appear in the introspection_data/full topic.

Observations

• When using data_type=bool, the signal is missing from introspection_data/full.
• Without changing any other part of the code, if I set the data type to double, the signal is published correctly.

Expected behavior
All the signals are there independent if the signal are boolean or double

Screenshots
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Environment (please complete the following information):

• OS: 24.04 but system is running inside the docker container
• Version 24.04
• Anything that may be unusual about your environment

Additional context
Add any other context about the problem here, especially include any modifications to ros2_control that relate to this issue.