CI: modernize GitHub Actions workflow matrix, actions v4, yarn caching, and lint step

[Talha12Shiekh]

Proposed Changes

Resolves issue #2322 by modernizing .github/workflows/test.yml to improve CI speed, reliability, and test coverage across Node.js LTS versions:

1. Updated Actions to v4: Replaced outdated actions/checkout@v2 and actions/setup-node@v2 with @v4.
2. Node.js Test Matrix: Updated test matrix strategy to test across Node.js 18.x, 20.x, and 22.x (aligning with current Volta config and Node LTS releases).
3. Dependency Caching: Enabled Yarn package caching (cache: 'yarn') to significantly accelerate CI workflow execution.
4. Deterministic Locks: Configured yarn install --frozen-lockfile to ensure lockfile integrity during CI builds.
5. CI Lint Step: Added "lint": "eslint src" script in packages/web/package.json and integrated yarn lint step in the workflow pipeline.

Linked Issues

• Fixes ci: add Node.js version matrix, caching, and lint step to test workflow #2322 (ci: test workflow gaps — node 22 only, no caching, missing lint step)

Checklist

• Describe the proposed changes and how it'll improve the library experience.
• Please make sure that there are no linting errors in the code.
• Add a demo video/gif/screenshot to explain how did you test the fix.
• If it is a global change, try to add any side effects that it could have.
• Create a PR to add/update the docs (if needed) at here.
• Create a PR to add/update the storybook (if needed) at here.

Improvements to the Library Experience

• CI Speed & Performance: Yarn dependency caching reduces workflow execution duration on every PR run.
• Reliability: Validates library builds against all active Node.js LTS versions (18.x, 20.x, 22.x).
• Code Quality: Automated ESLint validation on CI builds prevents unformatted or buggy code from entering next.

Side Effects

• None. Workflow changes affect GitHub Actions CI pipeline execution only.