[iron] Allow unknown types in bag rewrite (backport #1812)

[mergify]

This PR will allow ros2 bag convert to process bag files with "unknown" message types.
Unknown are the types which typesupport is not available during the bag conversion operation.

Also added proper handling for the ament_index_cpp::PackageNotFoundError exception throwing from the ament_index_cpp::get_package_share_directory(package);. It was causing abnormal converter or recorder termination if the package for message definition was not found in ament_index.

• Closes ros2 bag convert ignoring messages with unknown types #1811

  ---

  This is an automatic backport of pull request Allow unknown types in bag rewrite #1812 done by Mergify.

[mergify]

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Changes to be committed:
	modified:   rosbag2_cpp/test/rosbag2_cpp/test_local_message_definition_source.cpp
	modified:   rosbag2_transport/src/rosbag2_transport/bag_rewrite.cpp

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   rosbag2_cpp/src/rosbag2_cpp/message_definitions/local_message_definition_source.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: #1818
Gist: https://gist.githubusercontent.com/ahcorde/566e7fca493d7b0e12ef749db317750a/raw/968ef83a6f7ee8900922d303f5b6d64ac452c9d1/ros2.repos
BUILD args: --packages-above-and-dependencies rosbag2_cpp --packages-above-and-dependencies rosbag2_cpp
TEST args: --packages-above rosbag2_cpp --packages-above rosbag2_cpp
ROS Distro: iron
Job: ci_launcher
ci_launcher ran: https://ci.ros2.org/job/ci_launcher/14604

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

[MichaelOrlov]

Warnings on the RHEL CI build with messages like

no CONNEXTDDS_DIR nor NDDSHOME specified

are unrelated to the changes from this PR and are a known issue.
Merging then.