🛠️ Repo: Ensure `npm i` works for all supported Node versions, including devDeps

[mark-wiemer]

Tooling Suggestion Checklist

• I have tried restarting my IDE and the issue persists.
• I have pulled the latest main branch of the repository.
• I have read and agree to Mocha's Code of Conduct and Contributing Guidelines
• I have searched for related issues and issues with the faq label, but none matched my issue.
• I want to provide a PR to resolve this

Overview

Parent issue #6038 was opened because npm i started failing after merging a PR that upgraded a devDep to a version that only supported Node 22.22+, going against Mocha's support of Node 20.19+. Some CI check should've failed in this case, we should investigate and build gates to prevent this from happening again.

Additional Info

The breaking change was not documented. This doesn't excuse my choice to merge without fully vetting the changes, though! Filed a bug on the upstream repo.

[mark-wiemer]

npm i with Node 22.12 is also failing due to some other dependencies, even after patching the npm-run-all2 issue:

npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: '@eslint/config-array@0.23.5',
npm warn EBADENGINE   required: { node: '^20.19.0 || ^22.13.0 || >=24' },
npm warn EBADENGINE   current: { node: 'v22.12.0', npm: '10.9.0' }
npm warn EBADENGINE }
npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: '@eslint/config-helpers@0.6.0',
npm warn EBADENGINE   required: { node: '^20.19.0 || ^22.13.0 || >=24' },
npm warn EBADENGINE   current: { node: 'v22.12.0', npm: '10.9.0' }
npm warn EBADENGINE }
npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: '@eslint/core@1.2.1',
npm warn EBADENGINE   required: { node: '^20.19.0 || ^22.13.0 || >=24' },
npm warn EBADENGINE   current: { node: 'v22.12.0', npm: '10.9.0' }
npm warn EBADENGINE }
npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: '@eslint/js@10.0.1',
npm warn EBADENGINE   required: { node: '^20.19.0 || ^22.13.0 || >=24' },
npm warn EBADENGINE   current: { node: 'v22.12.0', npm: '10.9.0' }
npm warn EBADENGINE }
npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: '@eslint/markdown@8.0.1',
npm warn EBADENGINE   required: { node: '^20.19.0 || ^22.13.0 || >=24' },
npm warn EBADENGINE   current: { node: 'v22.12.0', npm: '10.9.0' }
npm warn EBADENGINE }
npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: '@eslint/object-schema@3.0.5',
npm warn EBADENGINE   required: { node: '^20.19.0 || ^22.13.0 || >=24' },
npm warn EBADENGINE   current: { node: 'v22.12.0', npm: '10.9.0' }
npm warn EBADENGINE }
npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: '@eslint/plugin-kit@0.6.1',
npm warn EBADENGINE   required: { node: '^20.19.0 || ^22.13.0 || >=24' },
npm warn EBADENGINE   current: { node: 'v22.12.0', npm: '10.9.0' }
npm warn EBADENGINE }
npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: 'eslint@10.4.0',
npm warn EBADENGINE   required: { node: '^20.19.0 || ^22.13.0 || >=24' },
npm warn EBADENGINE   current: { node: 'v22.12.0', npm: '10.9.0' }
npm warn EBADENGINE }
npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: 'eslint-plugin-n@18.0.1',
npm warn EBADENGINE   required: { node: '^20.19.0 || ^22.13.0 || >=24' },
npm warn EBADENGINE   current: { node: 'v22.12.0', npm: '10.9.0' }
npm warn EBADENGINE }
npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: '@eslint/plugin-kit@0.7.1',
npm warn EBADENGINE   required: { node: '^20.19.0 || ^22.13.0 || >=24' },
npm warn EBADENGINE   current: { node: 'v22.12.0', npm: '10.9.0' }
npm warn EBADENGINE }
npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: 'eslint-scope@9.1.2',
npm warn EBADENGINE   required: { node: '^20.19.0 || ^22.13.0 || >=24' },
npm warn EBADENGINE   current: { node: 'v22.12.0', npm: '10.9.0' }
npm warn EBADENGINE }
npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: 'eslint-visitor-keys@5.0.1',
npm warn EBADENGINE   required: { node: '^20.19.0 || ^22.13.0 || >=24' },
npm warn EBADENGINE   current: { node: 'v22.12.0', npm: '10.9.0' }
npm warn EBADENGINE }
npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: 'espree@11.2.0',
npm warn EBADENGINE   required: { node: '^20.19.0 || ^22.13.0 || >=24' },
npm warn EBADENGINE   current: { node: 'v22.12.0', npm: '10.9.0' }
npm warn EBADENGINE }
npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: 'eslint-visitor-keys@5.0.1',
npm warn EBADENGINE   required: { node: '^20.19.0 || ^22.13.0 || >=24' },
npm warn EBADENGINE   current: { node: 'v22.12.0', npm: '10.9.0' }
npm warn EBADENGINE }
npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: 'installed-check@10.0.1',
npm warn EBADENGINE   required: { node: '^20.19.0 || ^22.13.0 || >=24' },
npm warn EBADENGINE   current: { node: 'v22.12.0', npm: '10.9.0' }
npm warn EBADENGINE }