Unify source files for sync-file action into one repository

[isamu-takagi]

Checklist

• I've read the contribution guidelines.
• I've searched other issues and no duplicate issues were found.
• I've agreed with the maintainers that I can plan this task.

Description

Autoware repositories shares setting files using sync-file, but there is many source repository and it is difficult to know which files should be synchronized from.

For example, the sync-file.yaml in autoware.universe repository is copying files from autoware, autoware_common, and autoware-documentation repositories.

Purpose

By unifying source files for sync-file action into one repository, the settings for sync-file action will be easier to understand.

Possible approaches

Create a new repository to store the sync source files and place sync source files under an arbitrary directory to separate it from the repository own settings.

Definition of done

• Create a sync source repository.
• Move setting files.
• Update sync-file.yaml of each repository.

[isamu-takagi]

@mitsudome-r @xmfcx Could you please create a new repository?
Repository name: sync-file-templates

[mitsudome-r]

I have created the repository: https://github.com/autowarefoundation/sync-file-templates