feat(detect-changes): count ES-module and TypeScript files in the js bucket

[Adi-ty]

What this PR does

The js bucket in wp-tooling now also counts .cjs, .mjs, .jsx, .ts, .cts, .mts and .tsx files.

Closes

N/A

Changes

• src/ci/detect-changes.js: the regex changes from /.(?:js|snap)$|…/ to /.(?:[cm]?[jt]s|[jt]sx|snap)$|…/, plus a one-line comment listing what the bucket covers. It matches exactly those extensions. tsconfig.json, other .json files and .jsonc stay out.
• tests/ci/detect-changes.test.js: one new test. It checks that all the new extensions, .d.ts, eslint.config.mjs and a Jest snapshot are counted, and that tsconfig.json, data.json and a.jsonc are not.
• CHANGELOG.md: a ### Changed entry under ## [Unreleased], as the repo's checklist requires.

How I verified

npm run check

Acceptance criteria

Code quality

• Lint — zero errors
• Static analysis — zero errors
• Tests pass

Housekeeping

• CHANGELOG.md entry under ## Unreleased

[Copilot]

Copilot review overview

🟢 Approval recommended

The regex matches the stated extensions precisely, preserves existing behavior, and is adequately tested.

Review effort: Balanced
Findings: None

What changed in this PR

Expands JavaScript change detection to include ES-module and TypeScript file extensions.

Changes:

• Extends the js bucket regex with .cjs, .mjs, JSX, and TypeScript variants.
• Adds coverage for included and excluded extensions.
• Documents the behavior in the changelog.

File	Description
src/​ci/​detect-changes.js	Expands JavaScript bucket matching.
tests/​ci/​detect-changes.test.js	Tests new extensions and JSON exclusions.
CHANGELOG.md	Records the expanded detection behavior.

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