ci: adds -skip flag to the race tests (#1023)

Signed-off-by: Takeshi Yoneda <takeshi@tetrate.io>

internal/integration_test/fuzzcases/fuzzcases_test.go

@@ -314,9 +314,12 @@ func Test733(t *testing.T) {
 			require.Contains(t, err.Error(), "out of bounds memory")
 		})
 
-		// Note: this case uses large memory space, so can be slow like 1 to 2 seconds.
 		name = "store higher offset"
 		t.Run(name, func(t *testing.T) {
+			if testing.Short() {
+				// Note: this case uses large memory space, so can be slow like 1 to 2 seconds even without -race.
+				t.SkipNow()
+			}
 			f := mod.ExportedFunction(name)
 			require.NotNil(t, f)
 			_, err = f.Call(ctx)