WIP: Improve runner registration spec and add new runner verification method

What does this MR do?

Eliminates hard sleep in qa/specs/features/browser_ui/4_verify/runner/register_runner_spec.rb Adds new verification feature to Runner resource

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content