Update to chai 5 and remove karma-chai and karma-sinon #6071
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This PR updates to chai 5, by following the same strategy as in hypothesis/frontend-shared#1418, hypothesis/browser-extension#1438 and hypothesis/h#8403
The changes are mainly focused on removing karma-chai and karma-sinon, as these are very outdated dependencies, which main purpose is globally exposing chai.assert and sinon to tests.
This PR does that manually in our bootstrap file, and removes the plugins altogether. That way, karma does not try to load chai as a CommonJS package, since v5 is only ESM.