fix(npm): more granular Yarn 2 version detection

[ylemkimon]

This is somewhat requirement for #7200, as getLockedVersions only detects whether it's Yarn 1 or greater:

renovate/lib/manager/npm/extract/locked-versions.ts

Lines 18 to 22 in 9573c15

	const { lockedVersions, isYarn1 } = await getYarnLock(yarnLock);
	lockFileCache[yarnLock] = lockedVersions;
	if (!isYarn1) {
	packageFile.compatibility.yarn = '>= 2.0.0';
	}

unless engines.yarn is set:

renovate/lib/manager/npm/extract/index.ts

Lines 177 to 180 in 9573c15

	} else if (depName === 'yarn') {
	dep.datasource = datasourceNpm.id;
	dep.commitMessageTopic = 'Yarn';
	compatibility.yarn = dep.currentValue;

This PR detects the rough Yarn version using __metadata.cacheKey in yarn.lock.

[viceice]

Maybe we should think about a better yarn detection, as this becomes more and more complicated with every v2 minor version. 🤔

[renovate-release]

🎉 This PR is included in version 23.19.3 🎉

The release is available on:

• GitHub release
• 23.19.3

Your semantic-release bot 📦🚀