Removing threaded_blink test (duplicate of basic rtos test)

TESTS/integration/threaded_blinky/main.cpp

@@ -1,29 +0,0 @@
-#include "test_env.h"
-#include "mbed.h"
-#include "rtos.h"
-
-#if defined(MBED_RTOS_SINGLE_THREAD)
-  #error [NOT_SUPPORTED] test not supported
-#endif
-
-DigitalOut led1(LED1);
-
-  
-void led1_thread(void const *args) {
-    int count = 0;
-    while (true) {
-        Thread::wait(1000);
-        greentea_send_kv("tick", count);
-        count++;
-        led1 = !led1;
-    }
-}
- 
-int main() {
-    GREENTEA_SETUP(20, "wait_us_auto");
-    
-    Thread thread(led1_thread);
-    
-    while (true) {
-    }
-}