Add more strict linter settings and fix issues

[girodav]

No description provided.

[mergify]

This pull request does not have a backport label. Could you fix it @girodav? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit.

NOTE: backport-skip has been added to this pull request.

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 340b6a1

History

• 💔 Build #521 failed 9538d0b
• 💔 Build #520 failed af0e73e

cc @girodav