cleanup: mark more integration tests as !short mode (#755)

The objective is to make PR checks run much faster.

See https://github.com/ooni/probe/issues/2113 for context.

Regarding netxlite's tests:

Checking for every commit on master or on a release branch is
good enough and makes pull requests faster than one minute since
netxlite for windows is now 1m slower than coverage.

We're losing some coverage but coverage from integration tests
is not so good anyway, so I'm not super sad about this loss.

internal/engine/experiment/quicping/quicping_test.go

@@ -104,6 +104,9 @@ func TestInvalidHost(t *testing.T) {
 }
 
 func TestURLInput(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skip test in short mode")
+	}
 	measurer := NewExperimentMeasurer(Config{
 		Repetitions: 1,
 	})
@@ -123,6 +126,9 @@ func TestURLInput(t *testing.T) {
 }
 
 func TestSuccess(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skip test in short mode")
+	}
 	measurer := NewExperimentMeasurer(Config{})
 	measurement := new(model.Measurement)
 	measurement.Input = model.MeasurementTarget("google.com")
@@ -201,6 +207,9 @@ func TestListenFails(t *testing.T) {
 }
 
 func TestWriteFails(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skip test in short mode")
+	}
 	expected := errors.New("expected")
 	measurer := NewExperimentMeasurer(Config{
 		networkLib:  &FailStdLib{err: nil, readErr: nil, writeErr: expected},
@@ -229,6 +238,9 @@ func TestWriteFails(t *testing.T) {
 }
 
 func TestReadFails(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skip test in short mode")
+	}
 	expected := errors.New("expected")
 	measurer := NewExperimentMeasurer(Config{
 		networkLib:  &FailStdLib{err: nil, readErr: expected, writeErr: nil},
@@ -254,6 +266,9 @@ func TestReadFails(t *testing.T) {
 }
 
 func TestNoResponse(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skip test in short mode")
+	}
 	measurer := NewExperimentMeasurer(Config{
 		Repetitions: 1,
 	})