Disable job manager in instrumentation tests by default.

app/src/androidTest/java/org/thoughtcrime/securesms/SignalInstrumentationApplicationContext.kt

@@ -35,4 +35,18 @@ class SignalInstrumentationApplicationContext : ApplicationContext() {
       LogDatabase.getInstance(this).logs.trimToSize()
     }
   }
+
+  override fun beginJobLoop() = Unit
+
+  /**
+   * Some of the jobs can interfere with some of the instrumentation tests.
+   *
+   * For example, we may try to create a release channel recipient while doing
+   * an import/backup test.
+   *
+   * This can be used to start the job loop if needed for tests that rely on it.
+   */
+  fun beginJobLoopForTests() {
+    super.beginJobLoop()
+  }
 }