mirage: Add tests for `GET /api/v1/me/crate_owner_invitations` endpoint
mirage: Add tests for `GET /api/v1/me/crate_owner_invitations` endpoint

These tests are a little pointless because they test the route handler implementation in the exact same test, but they will allow us to refactor those route handlers into generic implementations using proper factories

rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io