Pass page and per_page into initialize for search results classes

The following discussion from !155516 (merged) should be addressed:

• @terrichu started a discussion: (+2 comments)

  thought: I'm not sure how else to make these variables available so other methods can access them. I need the issues method to stay as-is (where it doesn't have to know about the page/per_page) so it can be used in the highlight_map method.

  In an ideal world, page and per_page are passed in during the initialize method. I don't see a reason why objects needs to have them passed in. However, that change looks way too big to attempt as part of this refactor.