This commit moves the remaining searcher tests from using JSON marshaled types to using JSON responses for consistency. There appears to be a weird JSON marshaling error with search.Repository that does not map `Name` field in the process.
Additionally, the test scenarios around pulling multiple pages beneath the total results have been updated to demonstrate that the REST API returns full pages in both of these cases, which is below the total number of results.
This commit is focused on fixing the `searcher` tests for a few reasons:
1. Correcting the `.Total` logic in the previous commit caused changes to tests to fail
2. Tests involving results that exceed the max per page have been improved with new initialize helper, allowing testing table scenarios to be self contained
3. Tests that stub JSON response payloads have been standardized on maps rather than GitHub type primitives (Repository, Issue, Commit, Code, etc)
4. Tests had some minor formatting changes to make them easier to understand and maintain
