[Feature]: Update Visual Testing via Pipeline

[kpanot]

Context

In the current process, when we update the Showcase app, we need to regenerate the screenshot for Visual Testing manuellement in local.
The purpose of this feature is to provide a Github Workflow to trigger the generation of these screenshot.

Proposal

The Github Workflows should:

• Be trigger manually
• (?) Be trigger on the failure of the Visual Testing of a pull request targeting a secure branch (main and release/*)
• Create a Pull Request to a given branch (which is the Pull Request original branch when present on the repo)
• Shareable (or can be generated) to thrid party repositories