Cherry-picks for 2409.1 point release

[jhanca-robotecai]

What does this PR do?

This PR cherry-picks commits that should be included in the point release 2409.1. This includes the following PRs with the following reasoning:

• Update ros2 template package #769 fixes version numbers of the project templates; it was pushed to the stabilization/2409 branch after the release; it was used to generate the binary packages, but it was missing in the main branch
• fix ROS2FrameComponent::UpdateNamespaceConfiguration() #774 fixes the blocker issue that made custom namespaces unusable; it was pushed to the stabilization/2409 branch after the release; it was used to generate the binary packages, but it was missing in the main branch
• Correct ROS2 Gem version from 3.2.1 to 3.1.1 #775 fixes ROS 2 Gem version; it was pushed to the stabilization/2409 branch after the release; it was used to generate the binary packages, but it was missing in the main branch
• Extend functionality of FrameConversion.py to handle overrides #772 improves the helper script that can be used when migrating between ROS 2 Gems in 2310.x and 2409.x; the first version of the script incorrectly parsed prefabs overrides; the script does not influence O3DE itself
• Allow ROS2 Frame Component to be present on Level Entity #777 enables ROS2 Frame usage within the level entity; this PR can be considered as a feature or a fix of the oversight that existed since 2310.0; it does not influence the codebase or the existing projects/templates
• Fix FollowingCameraComponent: allow fly camera #778 fixes the bug that was making FollowingCameraComponent unusable with FlyCameraComponent (the problem existed since 2310.0)
• Registry setting for pipeline modification. #781 allows to disable fix from Enable ROS 2 camera pipeline modification #749 which fixed ROS2 Camera when GlobalIllumination was enabled but broke it when sky atmosphere was enabled; this can be now set with a registry
• revert of Fix bug in a spawner component #725 : this PR eliminated the warning, but it broke the ROS 2 transforms; after internal discussions with @MateuszWasilewski, @zakmat, and @michalpelka we decided to revert the change and implement a proper fix for the issue triggering warning for the next release; created an issue for that Change in #725 broke TFs #783

NOTE: when this PR is merged, there should be one more fix to follow, in which

• ROS2 Gem version is set to 3.2.2 as discussed on Discord channel
• patch version of all three ROS 2 templates is bumped after Registry setting for pipeline modification. #781
• repo.json file is regenerated to include files added in Registry setting for pipeline modification. #781

How was this PR tested?

ROS2ProjectTemplate was built and tested; more tests with other templates should follow

[jhanca-robotecai]

Force-pushed to fix DCO

[michalpelka]

Tested against released binary o3de 2409 in 4 scenarios:

• all three templates
• roscon demo2023 (development branch).
  Works as intended on Ubuntu 2204 with ROS 2 Humble.