Cleanup headers (backport #928)

[mergify]

Description

Cleanup headers

Did you use Generative AI?

Claude sonnet 4.6

---

This is an automatic backport of pull request #928 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 5c556d6 has failed:

On branch mergify/bp/humble/pr-928
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit 5c556d6.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   tf2/src/cache.cpp
	modified:   tf2/src/static_cache.cpp
	modified:   tf2/src/time.cpp
	modified:   tf2_bullet/include/tf2_bullet/tf2_bullet.hpp
	modified:   tf2_ros/src/tf2_echo.cpp
	modified:   tf2_ros/src/transform_listener.cpp

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   tf2_ros/src/buffer.cpp

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[ahcorde]

Pulls: #946
Gist: https://gist.githubusercontent.com/ahcorde/6a7dd35ea3882060d1e84a1aae868a84/raw/3de4bd5396ccf2ca19bbdaea3c05355042e334f1/ros2.repos
BUILD args: --packages-above-and-dependencies tf2 tf2_bullet tf2_ros
TEST args: --packages-above tf2 tf2_bullet tf2_ros
ROS Distro: humble
Job: ci_launcher
ci_launcher ran: https://ci.ros2.org/job/ci_launcher/19352

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