Format all existing files using Prettier

[mlqn]

Description

We currently have approximately 350 files that are not formatted according to our Prettier rules. This makes PRs harder to review when some of these files are edited.

I suggest fixing them once and for all by using the yarn prettier . -w command.

It could be a good idea to prevent linking this commit to someone in particular as suggested here.
Not sure what is the best solution, but one easy way to do it could be to create an artificial committer:

git config user.name "Prettier"
git config user.email "prettier@..."

We also need to find the right time to do it, preferably when we have fewer active feature branches, to reduce the risk of creating multiple merge conflicts.

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