chore: migrate to nodeLinker: node-modules

[MikeMcC399]

• closes CI lint fails under Node.js 24.15.0 LTS (TypeError) - Rev2 #837
• supersedes chore: migrate to nodeLinker: node-modules #817

Situation

corepack yarn lint fails with Node.js 24.15.0 LTS

TypeError: Cannot convert undefined or null to object

Node.js 24.15.0 is currently rolling out in ubuntu-latest, so failures are sporadic.

The corresponding upstream issue yarnpkg/berry#7106 is unresolved.

Change

Migrate the nodeLinker configuration setting from its default value to an explicit node-modules setting in a new .yarnrc.yml settings file:

Before	After
nodeLinker: pnp	nodeLinker: node-modules

To achieve this, cherry-pick 22a3fc0 from PR #652 originally submitted by @geigerzaehler.

The setting has no effect on the npm module published as corepack to the npm registry, apart from allowing the CI job chore ("Testing chores") to succeed under Node.js >=24.15.0. The nodeLinker setting is not part of the published npm module.

Verification

On Ubuntu 24.04.4 LTS, with Node.js 24.15.0 LTS, execute:

corepack yarn install
corepack yarn build
corepack yarn typecheck
corepack yarn lint
corepack yarn test

Confirm no errors and all tests passing.

[MikeMcC399]

The actual version of Node.js selected by the GitHub Actions runner is randomly 24.14.1 or 24.15.0 during the current ubuntu-24.04 rollout. As luck would have it https://github.com/nodejs/corepack/actions/runs/25918361425/job/76180620903?pr=847

executed the chore job in Node.js 24.15.0 and so has effectively tested that this PR provides a successful workaround for #837

[aduh95]

#817 had been approved (but closed by mistake I assume)

[MikeMcC399]

@aduh95

#817 had been approved (but closed by mistake I assume)

Thanks for merging!

#817 was intentionally closed, as I explained in the comment #817 (comment). GitHub did not allow me to re-open it (probably because I'd deleted the branch) and in any case the description in #817 was outdated, so I re-wrote it in a much simpler form for this PR.