Fix linter errors caused by vscode-extension-tester 5.9.1 (#3222)

* Bump vscode-extension-tester from 5.5.1 to 5.9.1

Bumps [vscode-extension-tester](https://github.com/redhat-developer/vscode-extension-tester) from 5.5.1 to 5.9.1.
- [Release notes](https://github.com/redhat-developer/vscode-extension-tester/releases)
- [Changelog](https://github.com/redhat-developer/vscode-extension-tester/blob/main/CHANGELOG.md)
- [Commits](redhat-developer/vscode-extension-tester@v5.5.1...v5.9.1)

---
updated-dependencies:
- dependency-name: vscode-extension-tester
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

* [build] Fix build errors usage when updating scode-extension-tester from 5.5.1 to 5.9.1
* Increase activation timeout
* Restrict vscode-extension-tester to a version that works with Node 18
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Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: Victor Rubezhny <vrubezhny@redhat.com>
Signed-off-by: David Thompson <davthomp@redhat.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Victor Rubezhny <vrubezhny@redhat.com>

Author: 3 people