Remove go-github-mock from repositories_test.go and issues_test.go

Co-authored-by: JoannaaKL <[email protected]>

Author: Copilot

pkg/github/helper_test.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/github/github-mcp-server/pkg/raw"
 	"github.com/modelcontextprotocol/go-sdk/mcp"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
@@ -637,6 +638,8 @@ func normalizeEndpointKey(endpoint any) string {
 			panic("nil EndpointPattern")
 		}
 		return v.Method + " " + v.Pattern
+	case raw.EndpointPattern:
+		return v.Method + " " + v.Pattern
 	default:
 		panic("unsupported endpoint type")
 	}