Fix bug when migrate from API (#8631)

* fix bug when migrate from API

* fix test

* fix test

* improve

* fix error message

integrations/api_repo_test.go

@@ -334,7 +334,7 @@ func testAPIRepoMigrateConflict(t *testing.T, u *url.URL) {
 		resp := httpContext.Session.MakeRequest(t, req, http.StatusConflict)
 		respJSON := map[string]string{}
 		DecodeJSON(t, resp, &respJSON)
-		assert.Equal(t, respJSON["message"], "The repository with the same name already exists.")
+		assert.Equal(t, "The repository with the same name already exists.", respJSON["message"])
 	})
 }