Unify repo names in system notices (#36491)

Fixes: https://github.com/go-gitea/gitea/issues/36211

This PR fixes ensures that all system notices consistently include
repository names in the format `"Action description (owner/repo): error
message"`.

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: silverwind <115237+silverwind@users.noreply.github.com>
Co-authored-by: silverwind <me@silverwind.io>

services/repository/fork.go

@@ -123,8 +123,8 @@ func ForkRepository(ctx context.Context, doer, owner *user_model.User, opts Fork
 	// WARNING: Don't override all later err with local variables
 	defer func() {
 		if err != nil {
-			// we can not use the ctx because it maybe canceled or timeout
-			cleanupRepository(repo.ID)
+			// we can not use `ctx` because it may be canceled or timed out
+			cleanupRepository(repo)
 		}
 	}()