Manually bump chai and pixelmatch, switch from commonJS base to ESM

[seunomonije]

Fixes #7159 (patch)

• Changed tsconfig.json to target primarily ESM instead of CommonJS, and handles all the downstream implications to keep repo functioning.
• nyc doesn't support ESM natively, so switched to c8 for now
• For mocha, need to tap into some experimental features to allow extensionless imports in typescript, a next step could be to modify the tests to not allow this
• Modified webpack config to be ESM compatible

All check pass, but with warnings:

(node:4511) ExperimentalWarning: `--experimental-loader` may be removed in the future; instead use `register()`:
--import 'data:text/javascript,import { register } from "node:module"; import { pathToFileURL } from "node:url"; register("./node_modules/ts-node/esm.mjs", pathToFileURL("./"));'
(Use `node --trace-warnings ...` to show where the warning was created)
(node:4511) [DEP0180] DeprecationWarning: fs.Stats constructor is deprecated.
(Use `node --trace-deprecation ...` to show where the warning was created)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.37%. Comparing base (7673240) to head (8eab54a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7652   +/-   ##
=======================================
  Coverage   99.37%   99.37%           
=======================================
  Files        1080     1080           
  Lines       96378    96378           
=======================================
  Hits        95775    95775           
  Misses        603      603           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.