feat: switch from vcstool to vcs2l

[xmfcx]

• Relevant Discussion: Switching from `vcstool` to `vcs2l` #6645

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• https://github.com/dirk-thomas/vcstool is no longer maintained.
• https://github.com/ros-infrastructure/vcs2l is its alternative maintained by the ROS team. It's a fork and drop-in replacement.

Manual developer tips

If you have ros-dev-tools installed

If you have installed sudo apt install ros-dev-tools before, remove it with sudo apt purge ros-dev-tools.

mfc@whale:~$ apt show ros-dev-tools
Depends: ros-build-essential, python3-bloom, python3-colcon-common-extensions, python3-colcon-mixin, python3-rosdep, python3-vcstool, wget

Then install:
sudo apt install ros-build-essential python3-bloom python3-colcon-common-extensions python3-colcon-mixin python3-rosdep python3-vcs2l wget in its place.

If you have only python3-vcstool installed

If you have installed sudo apt install python3-vcstool before, remove it with sudo apt purge python3-vcstool. And just install sudo apt install python3-vcs2l.

If you have the following line in your .bashrc, replace it:

• from: source /usr/share/vcstool-completion/vcs.bash
• to: source /usr/share/vcs2l-completion/vcs.bash

How was this PR tested?

CI.

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