This PR refactors the snackbar modules that was using legacy versions of
our state management.
We replace the old states with new ones and also the old scoped context
with component instance context.
### Solution
fullPath prop on attachement (when returned by backend) is updated to
'domain + path' (formerly 'path').
Consequently, getFileAbsoluteURI util in front is removed.
closes#8763
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Co-authored-by: etiennejouan <jouan.etienne@gmail.com>
Lucas Bordeau