Update project to Yarn 4
What does this MR do and why?
To avoid problems we seem to run into a lot, let's update to Yarn v4 up from the v1 series.
See: !4555 (comment 1747594842).
Merge request acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this merge request.
Edited by Evan Read