Attempt to make the usage of the Android emulator in CIs more robust

[skottmckay]

Description

Android emulator usage updates:

• Change approach to detecting boot has completed
  • use -delay-adb and a simple command (ls) with wait-for-device as the first step
    • this ensures enough startup has occurred for adb to be responsive
  • use secondary loop on the python side to check for sys.boot_completed to be set
    • doing the check on the python side provides more feedback and seems to work well
• make the 'stop' logic more precise by using psutil
• add internal timeout of 20 mins for emulator startup
  • waiting for the CI jobs overall timeout is way too long
  • value is hardcoded for now (most CIs startup in under 10 mins) but could be made configurable if needed

CI updates:

• add template for using the Android emulator
  • update CIs to use template
• reorder React Native CI
  • minimize the time the Android emulator or iOS simulator is running by moving some build steps around
  • don't run both at the same time
    • unnecessary and potentially adds significant memory pressure to the machine
• fix QNN Android emulator CI as much as possible
  • now everything works apart from running onnx_test_runner with the QNN EP

Motivation and Context

Fix inconsistent detection of the emulator boot completing.

[skottmckay]

I've run the new setup a lot of times and don't see the hang behavior. One CI from the PR did return an error from the emulator relatively quickly that I haven't seen before. Can't find any doco to know what -6 means though. If this happens more often we could add a retry to the startup to see if that helps.

https://dev.azure.com/onnxruntime/2a773b67-e88b-4c7f-9fc0-87d31fea8ef2/_apis/build/builds/1166434/logs/65

2023-10-12T11:41:19.0440240Z File "/Users/runner/work/1/s/tools/python/util/android/android.py", line 173, in start_emulator
2023-10-12T11:41:19.0477390Z raise RuntimeError(f"Emulator exited early with return code: {emulator_ret}")
2023-10-12T11:41:19.0505930Z RuntimeError: Emulator exited early with return code: -6