Replaced gazebo_ros_control by gazebo_ros2_control

[vonunwerth]

Description

When using the tags generated in the package.xml for the use of Gazebo Classic, rosdep failed because it could not find the package gazebo_ros_control.

ERROR: the following packages/stacks could not have their rosdep keys resolved to system dependencies: ...: Cannot locate rosdep definition for [gazebo_ros_control]

I changed the template for the package.xml to include gazebo_ros2_control

It could also be useful to include a second commented paragraph containing gz_ros2_control for Gazebo.

Checklist

• [x] Required by CI: Code is auto formatted using clang-format
• [x] Extend the tutorials / documentation reference
• [x] Document API changes relevant to the user in the MIGRATION.md notes
• [x] Create tests, which fail without this PR reference
• [x] Include a screenshot if changing a GUI
• [x] While waiting for someone to review your request, please help review another open pull request to support the maintainers