This backport changes made by EE to the files in the scripts/ directory.
This comes with a few changes to some scripts to make them work in the
single codebase setup.

Added stylelint to static-analysis
Updated yarn dependencies
CSS Fixes and rule adoptions of stylelint
Added stylelint-scss
Deduplicated yarn.lock to clear dependencies

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

However keep backward compatibility

Otherwise it could be confusing

TODO: fix offenders

Signed-off-by: Rémy Coutable <remy@rymai.me>

When a changelog has invalid YAML (typically, there is an unquoted @ at the
start of the author field), then the entry will be discarded. This script checks
all unreleased changelogs for validity, and runs as part of the static-analysis
step, so the pipeline will fail if this happens in future.

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>