Convert tests from Jest to node-test

[MVGRAO]

Summary of changes
Migration plan added

Added a tracked todo list (via the workspace todo tool) to break the Jest → node:test migration into clear, verifiable steps so we can convert tests incrementally and show progress.
Package scripts for node:test and Windows linting

Added/updated npm scripts in package.json: a test:node example (runs node --test) and Windows-friendly helpers: fix:eol (normalize EOLs) and lint:win (runs stylelint then npx eslint ...) so you can run tests/lint on Windows without POSIX wrapper failures.
TypeScript/ESLint coverage fix

Updated tsconfig.json to include tests//* and scripts//* so the TypeScript ESLint parser (parserOptions.project) covers test and script files.
Added file-level ESLint disable comments to setup-env.ts to avoid setup-file-specific lint failures (dev-dep imports and class-count).
Repository EOL normalization & enforcement

Added .gitattributes to enforce LF for source files and prevent new CRLF commits.
Added normalize-line-endings.js and the npm run fix:eol script to convert CRLF → LF across the repo so ESLint linebreak-style errors are resolved.
Lint-rule compliance / script hardening

Updated the normalizer script to remove continue and replace console.log with process.stdout.write to satisfy ESLint rules (no-continue, no-console).
Converted target test files to LF line endings so npx eslint --fix and npm run lint:win can run with far fewer errors.

[openedx-webhooks]

Thanks for the pull request, @MVGRAO!

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[bradenmacdonald]

Hi @MVGRAO, thanks! Could you please sign the CLA?

[bradenmacdonald]

Relates to #2725

[mphilbrick211]

@MVGRAO hi there, and thanks for this contribution! Please let us know if you have any questions regarding completing a CLA form. Thanks!

[MVGRAO]

@bradenmacdonald @mphilbrick211 I have submitted the form