js-tests.md: Refer to chai as an ES module

[olleolleolle]

Since 5.0, chai is distributed as an ES module, no need for the wrapper.

What I did

1. I modernized the reference to chai in the example.

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[bashmish]

There are many more mentions of @esm-bundle/chai in the code.
In the documentation should be easy to do that.
In the code and tests I think this is a required change too then, also to verify all works with chai 5.x.
I think these changes should go as a whole.

[olleolleolle]

@bashmish Thanks! I took a look, learned a little about the structure, and then saw this was too big of a change for me to do without knowing more about the project.

If someone wants to carry this change, be welcome to it!

[bashmish]

I think this is a good first issue. It's impactful, but if chai 5 is compatible, it should be relatively easy to do.
This can help to start changing and prepare a PR https://github.com/modernweb-dev/web/blob/master/CONTRIBUTING.md

[bashmish]

@esm-bundle/chai needs to be replaced with chai native ESM everywhere in the docs, code and tests.