[CI] Add Fabbot as a GitHub Actions

[Kocal]

Q	A
Bug fix?	no
New feature?	no
Docs?	no
Issues	Fix #...
License	MIT

refs:

• Leverage symfony-tools/fabbot symfony#61260
• Enable Fabbot as a GHA twigphp/Twig#4671
• https://github.com/symfony-tools/fabbot

Since the code formatting process if more transparent, maybe we will remove the job coding-style-php that manually execute PHP-CS-Fixer (we had many formatting issues in the past)

[Kocal]

@nicolas-grekas The step Check PR header is failing with error message syntax error near unexpected token |', I think that's because the presence of " character in the PR_BODY

Maybe something like:

PR_TITLE=$(cat <<EOF
${{ github.event.pull_request.title }}
EOF
)
PR_BODY=$(cat <<EOF
{{ github.event.pull_request.body }}
EOF
)

?

[nicolas-grekas]

package: Symfony UX this means @deprecated should all start with @deprecated since Symfony UX that's not the case at the moment, let's fix this also?

[Kocal]

yes we will need to fix this too, actually we have no conventions at all

[nicolas-grekas]

fabbot should be fixed
can you fix the @deprecated in the same PR?
they should all start with @deprecated since Symfony UX X.y, etc

[Kocal]

Thanks, I will fix the deprecated annotations

[nicolas-grekas]

Suggested change

	name: Fabbot
	name: CS

[Kocal]

I would prefer keeping Fabbot or even PHP CS since we have other coding styles checks (for JS)

[OskarStark]

Same here, I am also used to tell people "Please make Fabbot happy" :-)