Add support for providing any emulator launch options as action input. Remove headless input which might overlap with emulator-options.

.github/workflows/workflow.yml

@@ -32,6 +32,6 @@ jobs:
         target: google_apis
         arch: x86_64
         profile: Nexus 6
-        headless: true
+        emulator-options: -no-window -no-snapshot -noaudio -no-boot-anim -camera-back emulated
         disable-animations: true
         script: adb devices -l