chore: remove unused chai (#118)

## Proposed changes

[//]: # 'Describe the big picture of your changes here to communicate to
the maintainers why we should accept this pull request. If it fixes a
bug or resolves a feature request, be sure to link to that issue.'

remove unused chai

## Types of changes

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- [ ] Polish (an improvement for an existing feature)
- [ ] Bugfix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] Documentation update (improvements to the project's docs)
- [x] Internal updates (everything related to internal scripts,
governance documentation and CI files)

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[CONTRIBUTING](https://github.com/webdriverio/vscode-webdriverio/blob/main/CONTRIBUTING.md)
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- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have added the necessary documentation (if appropriate)
- [ ] I have added proper type definitions for new commands (if
appropriate)

## Further comments

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### Reviewers: @webdriverio/project-committers

Author: noritaka1166

e2e/package.json

@@ -36,7 +36,6 @@
     "@wdio/mocha-framework": "^9.16.2",
     "@wdio/spec-reporter": "^9.16.2",
     "@wdio/types": "^9.16.2",
-    "chai": "^5.2.0",
     "expect": "^30.0.0",
     "semver": "^7.7.2",
     "wdio-vscode-service": "^6.1.3",