[humble] Rewrite TimeControllerClockTest.unpaused_sleep_returns_true to be correct (backport #1384)

[mergify]

This is an automatic backport of pull request #1384 done by Mergify.
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	both modified:   rosbag2_cpp/test/rosbag2_cpp/test_time_controller_clock.cpp

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[emersonknapp]

backports fix for #1282

[emersonknapp]

Build is broken because no TimeControllerClock::ros_to_steady method. Either need to backport the method or rewrite the test a little for Humble.

[emersonknapp]

Backported ros_to_steady as a non-virtual method to make the test work. This is an ABI-stable change (virtual would not be)

[emersonknapp]

Pulls: #1390
Gist: https://gist.githubusercontent.com/emersonknapp/993918a4ca416235bb9e912a335caa1e/raw/29f77d4946e829998f219b140721a18e7d8acaef/ros2.repos
BUILD args: --packages-above-and-dependencies rosbag2_cpp
TEST args: --packages-above rosbag2_cpp
ROS Distro: humble
Job: ci_launcher
ci_launcher ran: https://ci.ros2.org/job/ci_launcher/12210

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