test(e2e, windows): allow android e2e to run on windows

there was a serious problem with config file discovery for
the firebase emulator suite, this forces the location, then
all the tests for android appear to work well

there was a second problem where the emulator UI port was
taken, this lets it float

Author: mikehardy

.github/workflows/scripts/firebase.json

@@ -33,8 +33,7 @@
       "port": "9199"
     },
     "ui": {
-      "enabled": true,
-      "port": 4000
+      "enabled": true
     }
   }
 }

.github/workflows/scripts/start-firebase-emulator.bat

@@ -1 +1,6 @@
-yarn firebase emulators:start --only auth,database,firestore,functions,storage --project react-native-firebase-testing
+@REM this pushd is likely not needed, but just in case
+pushd "%~dp0"
+@REM this is just to see what our current directory is. Should be .github/workflow/scripts
+echo %cd%
+@REM strangely, unless you specify the config file as being right in the current directory, it won't find it, and everything fails
+yarn firebase emulators:start --config %cd%\firebase.json --only auth,database,firestore,functions,storage --project react-native-firebase-testing