* Add ApiOptions overloads to repository invitations.
* Remove ExcludeFromPaginationApiOptionsConvention for RepositoryInvitationsClient
* Adjust tests to new call form.
* Add null check and null check test for RepositoryInvitations.
* Add integration tests draft.
* Remove redundant using.
* Replace Octocat with dual account test second user.
* Fix mass repository creation by making it synchronous and fix last RepositoryInvitationsClient test utilizing Octokit user.
* Refactor async hack.
* Reduce number of created test repos.