Fetch achievements data from beta cluster for beta variant of the app

[maskaravivek]

Description (required)

Fixes #2975

What changes did you make and why?

Started using updated API for beta statistics.

Tests performed (required)

Tested on beta debug

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[neslihanturan]

Yay it works on beta cluster! I experienced an issue but I think this is a problem independent from this PR.

[neslihanturan]

Hi @maskaravivek , I have ecperienced this on prodDebug:

2019-06-04 14:55:18.300 4358-4358/fr.free.nrw.commons E/AchievementsActivity: Fetching upload count failed
java.lang.NumberFormatException: For input string: ""
at java.lang.Integer.parseInt(Integer.java:620)
at java.lang.Integer.parseInt(Integer.java:643)
at fr.free.nrw.commons.mwapi.OkHttpJsonApiClient.lambda$getUploadCount$0(OkHttpJsonApiClient.java:102)
at fr.free.nrw.commons.mwapi.-$$Lambda$OkHttpJsonApiClient$9ZpGX0U5Zngts_jcRCFls7FtEIM.call(Unknown Source:4)
at io.reactivex.internal.operators.single.SingleFromCallable.subscribeActual(SingleFromCallable.java:44)
at io.reactivex.Single.subscribe(Single.java:3438)
at io.reactivex.internal.operators.single.SingleSubscribeOn$SubscribeOnObserver.run(SingleSubscribeOn.java:89)
at io.reactivex.Scheduler$DisposeTask.run(Scheduler.java:578)
at io.reactivex.internal.schedulers.ScheduledRunnable.run(ScheduledRunnable.java:66)
at io.reactivex.internal.schedulers.ScheduledRunnable.call(ScheduledRunnable.java:57)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:301)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at java.lang.Thread.run(Thread.java:764)

Do you think this is related with this PR? Or should I create another issue for this error?

[ashishkumar468]

@neslihanturan , The crash is not related to this PR, I faced this too, fortunately the fix was very small, have raised a PR for the same.

[maskaravivek]

Can this be merged then?