Simplify affected package checks

[cristianrgreco]

Summary

• Replace the Bash changed-module detector with a small Node script that emits the affected package matrix.
• Simplify the checks workflow to use native git diff for changed files and run package checks only for affected packages.
• Preserve the existing workspace-specific node_modules cache behavior while simplifying the cache action usage.
• Remove unused Windows test dispatch/test workflows and unused Colima, Docker rootless, and Rancher Desktop CI setup actions.
• Include .github/**/*.mjs in the repo format and lint scripts so the detector stays covered by normal maintenance checks.

Verification

Commands run:

• npm ci
• npm run format
• npm run lint
• node --check .github/scripts/changed-modules.mjs
• git diff --check

Additional checks:

• Parsed edited workflow/action YAML with Ruby YAML.load_file.
• Exercised the changed-module detector for module-only, core/all-packages, and docs-only changes.

Test Results Summary

Formatting and linting passed. The detector produced the expected package matrix for the checked scenarios. No package test suite was run because this change only touches GitHub Actions workflow wiring and helper scripts.

Semver Impact

Patch. This is a CI-only maintenance change and does not alter the published package API or runtime behavior, so it is not breaking.

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