chore(deps): Bump chai from 4.3.10 to 5.1.1 (#8092)

* chore(deps): Bump chai from 4.3.10 to 5.1.1

  Bumps [chai](https://github.com/chaijs/chai) from 4.3.10 to 5.1.1.
  - [Release notes](https://github.com/chaijs/chai/releases)
  - [Changelog](https://github.com/chaijs/chai/blob/main/History.md)
  - [Commits](https://github.com/chaijs/chai/compare/v4.3.10...v5.1.1)

  ---
  updated-dependencies:
  - dependency-name: chai
    dependency-type: direct:development
    update-type: version-update:semver-major
  ...

  Signed-off-by: dependabot[bot] <support@github.com>

* fix(tests): Migrate all usage of chai to ESM (#8216)

* fix(tests): Migrate node tests from CJS to ESM

  This allows us to import (rather than require) chai, fixing failures
  caused by that package dropping suppport for CJS in chai v5.0.0.

* fix(tests): Have mocha tests directly import chai

  Previously they relied on obtaining it from the global scope, but it's
  better if imports are explicit.

* fix(tests): Remove broken load of chai as script

  Chai v5.0.0 no longer supports being loaded as a script, so this did
  nothing but emit an syntax error message on the console.

* fix(tests): Migrate browser tests from CJS to ESM

  This allows us to import (rather than require) chai, fixing failures
  caused by chai no longer supporting CJS.

* chore(tests): format

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Christopher Allen <cpcallen+git@google.com>

tests/mocha/index.html

@@ -21,7 +21,6 @@
     <!-- Load mocha et al. before Blockly and the test modules so that
          we can safely import the test modules that make calls
          to (e.g.)  suite() at the top level. -->
-    <script src="../../node_modules/chai/chai.js"></script>
     <script src="../../node_modules/mocha/mocha.js"></script>
     <script src="../../node_modules/sinon/pkg/sinon.js"></script>
     <script>