Refactor license template finder in jh

What does this MR do and why?

This MR refactors !904 (merged) by apply suggestion from songhuang

English version of suggestion:
The change relies on more code from global, and if global refactored that part of the code, it could cause our functionality to fail. So it is recommended to write a MR to global that refactors this part of the code in global into a separate method.

def available_license
  Licensee::License.all(featured: popular_only?)
end

and then we can just prepend that method.

upstream tracker: gitlab!98623(merged)

Describe in detail what your merge request does and why.

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