Removed examples tests for BLE

As mbed-events is being brought into the mbed-os tree, the examples
using the external mbed-events library will fail due to duplicate
definitions.

The tests for BLE examples will be readded after the examples are
updated to only use the mbed-events library in the mbed-os tree.

Author: geky

tools/test/examples/examples.json

@@ -1,9 +1,5 @@
 {
     "https://developer.mbed.org/teams/mbed-os-examples/code/mbed-os-example-blinky" : {},
-    "https://developer.mbed.org/teams/mbed-os-examples/code/mbed-os-example-ble-Beacon" :
-    {"features": ["BLE"]},
-    "https://developer.mbed.org/teams/mbed-os-examples/code/mbed-os-example-ble-HeartRate" :
-    {"features": ["BLE"]},
     "https://developer.mbed.org/teams/mbed-os-examples/code/mbed-os-example-mesh-minimal" :
     {"features": ["IPV6"]},
     "https://github.com/ARMmbed/mbed-os-example-client" : {"features": ["IPV6"]},