Android UserInteractionIntegration doesn't start after deferred init

[krystofwoldrich]

When the Sentry Android SDK init is deferred the UserInteractionIntegration doesn't start tracking until a new activity is created/resumed.

Related to: #4337

Related integration code:

sentry-java/sentry-android-core/src/main/java/io/sentry/android/core/UserInteractionIntegration.java

Lines 31 to 36 in 2748875

	public UserInteractionIntegration(
	final @NotNull Application application, final @NotNull io.sentry.util.LoadClass classLoader) {
	this.application = Objects.requireNonNull(application, "Application is required");
	isAndroidXAvailable =
	classLoader.isClassAvailable("androidx.core.view.GestureDetectorCompat", options);
	}

Expectation: The Interaction tracking will start on integration creation if the current activity holder holds existing activity.