Skip slower gps tests on -short

internal/gps/source_manager_test.go

@@ -13,6 +13,10 @@ import (
 )
 
 func TestSourceManager_InferConstraint(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping slow test in short mode")
+	}
+
 	t.Parallel()
 
 	// Used in git subtests:

internal/gps/vcs_version_test.go

@@ -12,6 +12,10 @@ import (
 )
 
 func TestVCSVersion(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping slow test in short mode")
+	}
+
 	h := test.NewHelper(t)
 	defer h.Cleanup()
 	requiresBins(t, "git")