feat(npm): use Yarn 3 mode to skip install or build

[ylemkimon]

Changes:

• Set skipInstalls = false if zero-installs is used.
• Use new Yarn 3 --mode=update-lockfile flag to not run the link step and only fetch what's necessary to compute an updated lockfile if config.skipInstalls !== false.
• Use --mode=skip-build to not run the build scripts instead of skipping the whole build step (enableScripts: false) if !adminConfig.allowScripts || config.ignoreScripts.

Context:

This PR fixes #10061 and reduces network bandwidth by fetching only necessary packages. This PR also fixes #7584 by running the build step that unplugs packages.

Caveat

Yarn built between yarnpkg/berry@9bcd27a and yarnpkg/berry@d132132 would cause an invalid option error. This would affect:

• Yarn 3 release candidates (3.0.0-rc.1 to 3.0.0-rc.9)
• yarn set version from sources run between two commits

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please tick one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository (https://github.com/ylemkimon/renovate-yarn-3)

[viceice]

Should also be tested on exiting yarn v1 and yarn v2 projects to be safe?

[rarkins]

Where would be the best place to check this?

skipInstalls logic is spread a little between npm/extract and npm/post-update today, so I think you can put it in either of those where it's useful. I guess it needs to be after we detect yarn version

[ylemkimon]

Sorry for the delay. It now sets skipInstalls = false if zero-installs is used, i.e., .yarn/cache and related files are detected in extractPackageFile(). This PR is ready for review.

[viceice]

Some small changes

[viceice]

Please use re-request review buttons 🙃

[ylemkimon]

I didn't know a non-member could do that 😄

[viceice]

Also the author of the PR is allowed to use that. 🤗

[renovate-release]

🎉 This PR is included in version 26.12.0 🎉

The release is available on:

• GitHub release
• 26.12.0

Your semantic-release bot 📦🚀

[ylemkimon]

Thank you for the reviews!