Remove dirty-chai dependency

[ggrossetie]

The project has a peerDependencies on chai with a version range:

"peerDependencies": { 
   "chai": ">=2.2.1 <5" 
 }, 

As a result, it prevents us from (cleanly) upgrading to Chai 5.x.
The project seems to be unmaintained and we should probably just configure eslint to accept/ignore to.be.true statement.

Alternative: https://github.com/ihordiachenko/eslint-plugin-chai-friendly