Add unit tests to e2e test suite

[makkes]

The following tests are currently part of the unit test suite but actually depend on a running Gitea instance. They should be moved to the e2e suite and then use the provided Gitea instance instead of relying on gitea.com (which we have no control over which has already caused test failures in the past.

• ExampleOrgRepositoriesClient_Get
• ExampleOrganizationsClient_Get