Refactor component containers

[mini-1235]

Description

Supersedes #3055

Is this user-facing behavior change?

Yes,

• When users use component_container_mt/component_container_event/component_container_isolated, they will see a warning message
• When using component_container without any arguments, it will default to non isolated + single threaded, so users will probably not notice this change

Did you use Generative AI?

Yes, Github Copilot

Additional Information

[skyegalaxy]

Would we be able to also include component containers for the new callback group events executor? I had a draft PR to do so but it was blocked by several cascading PRs waiting on green CI to get in

[mini-1235]

Sure :) I didn't include it here since this PR is mainly focused on refactoring the existing component containers. Should I go ahead and include it in this one?

[mini-1235]

I took a look through the core repositories, and I don't think anything is currently using component_container_mt/event/isolated, the only thing that seems to need updating is ros2/ros2_documentation#6401