fix: add null check for endSessionPromise

[alfonsosn]

Description

Our team has been affected by a crash on Android and following the stack trace, this is what we see:

Exception java.lang.NullPointerException: Attempt to invoke interface method 'void com.facebook.react.bridge.Promise.resolve(java.lang.Object)' on a null object reference
  at com.rnappauth.RNAppAuthModule.onActivityResult (RNAppAuthModule.java:582)

We haven't been able to reproduce in our devices yet, but we do see that the following line doesn't have the null check that other promises have in this file:

            final Promise endSessionPromise = this.promise;
            WritableMap map = EndSessionResponseFactory.endSessionResponseToMap(response);
            endSessionPromise.resolve(map);

We believe that by adding a null pointer check on the endSessionPromise, we can remove this exception.

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