Revert "ci: Add a new Wi-Fi QA required label"

This reverts commit 9ea0f96.

The process on how to use the label is not streamlined yet, so, for now
reverting this till it's sorted.

Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>

Author: krish2718

.github/labeler.yml

@@ -23,9 +23,3 @@
   - "samples/bluetooth/mesh/*"
   - "doc/nrf/libraries/bluetooth_services/mesh/*"
   - "doc/nrf/ug_bt_mesh*"
-
-"wifi-qa-required":
-  - "drivers/wifi/**/*"
-  - "samples/wifi/**/*"
-  - "modules/hostap/**/*"
-  - "modules/lib/hostap/**/*"