feat: Update the entry point for ooni run v2 to use load using a different screen

[aanorbel]

Proposed Changes

• Add OoniRunV2Activity to handle all incoming OONI Run v2 Intents
• Update AndroidManifest.xml to launch OoniRunV2Activity when OONI Run v2 Intents are received.
• Clean MainActivity
• Override onBackPressed and finish in AddDescriptorActivity to ensure activity always launches MainActivity when closed

.	Possible Areas of Improvement
	-Improve on error messages. - Merge with AddDescriptorActivity to make a single activity with 2 fragments for each of the views (requires a bit of core rewrite).

[bassosimone]

We should take care of this failure in test / test (push):

org.openobservatory.ooniprobe.test.suite.AbstractSuiteTest > getSuiteTest FAILED
    java.lang.NullPointerException at AbstractSuiteTest.java:96

org.openobservatory.ooniprobe.test.suite.ExperimentalSuiteTest > initializationError FAILED
    org.junit.runners.model.InvalidTestClassError at ParentRunner.java:525

There is also this error in emulator / test:

> Task :app:compileStableFullDebugAndroidTestJavaWithJavac FAILED
The following annotation processors are not incremental: dbflow-processor-4.2.4.jar (com.github.Raizlabs.DBFlow:dbflow-processor:4.2.4).
Make sure all annotation processors are incremental to improve your build speed.
/Users/runner/work/probe-android/probe-android/app/src/androidTest/java/org/openobservatory/ooniprobe/ui/resultdetails/WebsitesTest.java:17: error: cannot find symbol
import org.openobservatory.ooniprobe.test.suite.WebsitesSuite;
                                               ^
  symbol:   class WebsitesSuite
  location: package org.openobservatory.ooniprobe.test.suite
Note: /Users/runner/work/probe-android/probe-android/app/src/androidTest/java/org/openobservatory/ooniprobe/ui/resultdetails/PerformanceTest.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
1 error

[bassosimone]

🐳 with request to apply minor changes and to fix broken tests

[bassosimone]

Do we anticipate to always support run.test or are we going to switch to only run.ooni.org in the future? In the former case, I'd proactively document both; in the latter I'd just document run.ooni.org.

[aanorbel]

This has not been discussed int the past. the final resting domain for OONI Run V2 has not been discussed. I am not sure at the moment what it would be changed to in the future.

[bassosimone]

Where is intent declared?

[aanorbel]

Intent is declared in the activity that it inherits.