refactor(server): collapse type module into gitforge module

Repository is now behind an enum to allow selection of a mock Repsitory
for use in tests.

crates/git/src/repository/open/tests.rs

@@ -27,6 +27,7 @@ mod fetch {
     use git_next_config::GitDir;
 
     #[test]
+    #[ignore] // requires authentication to the server
     fn should_fetch_from_repo() {
         // uses the current repo and fetches from the remote server
         let_assert!(Ok(cwd) = std::env::current_dir());