Bump Yarn 1.22.22 -> 4.9.4 - Remove sha1 hashes #1555
Merged
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See ADO task TASK 2576673
NOTE: SHA-1 is not allowed for any purpose, visit Microsoft.Security.Cryptography.10021 for details.
Therefore bumped to latest yarn javascript package manager to avoid sha1 hashing of package binaries.
This adds the yarn berry config / package files: .yarn/ project-local workspace and .yarnrc.yml berry config
Note: Here we bootstrap yarn in devcontainer postCreate. WE also download yarn 4.9.4 locally and refer to it from package.json. Just in case devcontainers not used.