Hygiene: add testAll* Gradle tasks
Hygiene: add testAll* Gradle tasks

Add testAll* Gradle tasks that execute both JVM JUnit and Android
instrumentation tests per variant.

Change-Id: I75e660991225b6a09c7a94d61f51bf124e357f76

anirudh24seven/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,parvez3019/apps-android-wikipedia,Wikinaut/wikipedia-app,Wikinaut/wikipedia-app,parvez3019/apps-android-wikipedia,parvez3019/apps-android-wikipedia,reproio/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android,wikimedia/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,parvez3019/apps-android-wikipedia,Wikinaut/wikipedia-app,Duct-and-rice/KrswtkhrWiki4Android,Wikinaut/wikipedia-app,Duct-and-rice/KrswtkhrWiki4Android,wikimedia/apps-android-wikipedia,Wikinaut/wikipedia-app,dbrant/apps-android-wikipedia,parvez3019/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android,carloshwa/apps-android-wikipedia,reproio/apps-android-wikipedia,reproio/apps-android-wikipedia,carloshwa/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,Duct-and-rice/KrswtkhrWiki4Android,SAGROUP2/apps-android-wikipedia,reproio/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,carloshwa/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,carloshwa/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,dbrant/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,anirudh24seven/apps-android-wikipedia,reproio/apps-android-wikipedia,dbrant/apps-android-wikipedia,SAGROUP2/apps-android-wikipedia,carloshwa/apps-android-wikipedia