Add support for ffmpeg_image_transport to Image/Camera displays and point_cloud_transport/cloudini to PointCloud2 display (backport #1568)

[mergify]

Description

• fix topic handling in Camera display to support images compressed by any supported image_transport
• make Image and Camera display support images compressed by ffmpeg_image_transport
• make PointCloud2 display support point clouds compressed by cloudini

Is this user-facing behavior change?

• users can now select ffmpeg-compressed images in Image and Camera displays
• users can now select cloudini-compressed point clouds in PointCloud2 displays

Did you use Generative AI?

Yes, GitHub Copilot auto-completion.

Additional Information

Related to #1288?

---

This is an automatic backport of pull request #1568 done by Mergify.

[mergify]

Cherry-pick of a33b5e9 has failed:

On branch mergify/bp/humble/pr-1568
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit a33b5e94.
  (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:   rviz_default_plugins/src/rviz_default_plugins/displays/camera/camera_display.cpp
	modified:   rviz_default_plugins/src/rviz_default_plugins/displays/image/get_transport_from_topic.cpp

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   rviz_default_plugins/src/rviz_default_plugins/displays/pointcloud/get_transport_from_topic.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: #1572
Gist: https://gist.githubusercontent.com/ahcorde/31fd991a6c834a3357996fd391f6a226/raw/56262352fd984017c69bea790c4e252b8edcdd3b/ros2.repos
BUILD args: --packages-above-and-dependencies rviz_default_plugins
TEST args: --packages-above rviz_default_plugins
ROS Distro: humble
Job: ci_launcher
ci_launcher ran: https://ci.ros2.org/job/ci_launcher/16815

• Linux
• Linux-aarch64
• Linux-rhel
• Windows

[ahcorde]

Pulls: #1572
Gist: https://gist.githubusercontent.com/ahcorde/50706893514784bb4dbf467d81757ab0/raw/56262352fd984017c69bea790c4e252b8edcdd3b/ros2.repos
BUILD args: --packages-above-and-dependencies rviz_default_plugins
TEST args: --packages-above rviz_default_plugins
ROS Distro: humble
Job: ci_launcher
ci_launcher ran: https://ci.ros2.org/job/ci_launcher/16819

• Linux
• Linux-aarch64
• Linux-rhel
• Windows