Fix sign out after force quit in Android (#375)

Removes intentional Realm file deletion to avoid unintentional Realm file deletion, though the latter remains something of a mystery.

* Configure Realm with the full path to the file
* Remove all Realm.open calls in AuthenticationService in favor of passing the
  context/provider copy of realm (only one realm instance)
* Only delete the realm file on sign out if deleting realm contents fails for
  some reason
* Replaced deleteRealm with semantically more accurate clearRealm

Closes #373

react-native-logs.config.js

@@ -1,5 +1,6 @@
 import RNFS from "react-native-fs";
 import {
+  consoleTransport,
   fileAsyncTransport,
   logger
 } from "react-native-logs";
@@ -7,8 +8,16 @@ import {
 const fileName = "inaturalist-rn-log.txt";
 const logFilePath = `${RNFS.DocumentDirectoryPath}/${fileName}`;
 
+// Configure without transport for test. If you want to write output during
+// tests, use console.log
+const transport = [];
+if ( process?.env?.NODE_ENV !== "test" ) {
+  transport.push( consoleTransport );
+  transport.push( fileAsyncTransport );
+}
+
 const config = {
-  transport: fileAsyncTransport,
+  transport,
   transportOptions: {
     FS: RNFS,
     fileName