feat(*): upgrade to the latest emulator updates

[dackers86]

fixes: #689

[huangjeff5]

LGTM, please wait for Joe's review too.

[joehan]

LGTM with one question

[joehan]

Is there any potential for a race condition here? ie can the tests start running before the emulator starts up?

[dackers86]

Yes, there could be. I'm currently refining and playing with examples, we could for example run an sh script, something like....?

#!/bin/bash
if ! [ -x "$(command -v firebase)" ]; then
  echo "❌ Firebase tools CLI is missing."
  exit 1
fi

until curl --output /dev/null --silent --fail http://localhost:9099; do
  echo "Waiting for Firestore emulator to come online..."
  sleep 2
done

echo "Firestore emulator is online!" 

cd ../functions
jest --watch