Improve speed for checking if a group already exists

What does this MR do and why?

Refactor method for checking if a group already exists before fabricating it to increase the speed when fabricating via browser_ui

Previously on average took around 67 seconds

Built a QA::Resource::Sandbox with full_path 'free-group-99393b447ab15bfc' via browser_ui in 67.01 seconds

After refactor on average takes around 14 seconds

Built a QA::Resource::Sandbox with full_path 'free-group-110e938fbd2163ee' via browser_ui in 14.37 seconds

Describe in detail what your merge request does and why.

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