test(telemetry): assert ANSI escape chars for color codes

Signed-off-by: Babak K. Shandiz <babakks@github.com>

internal/telemetry/telemetry_test.go

@@ -364,6 +364,7 @@ func TestLogFlusherWritesNoneMarkerForEmptyPayload(t *testing.T) {
 		output := buf.String()
 		assert.Contains(t, output, "Telemetry payload:")
 		assert.Contains(t, output, "none")
+		assert.Contains(t, output, "\x1b") // ANSI escape char for color codes
 	})
 }