Intents.assertNoUnverifiedIntents() should ignore `BootstrapActivity` intents

### Description

Launching an activity with `ActivityScenario` adds extra unexpected intents.
When you call `Intents.assertNoUnverifiedIntents()` you get a failure.

`BootstrapActivity` intents should be ignored for purposes of `assertNoUnverifiedIntents()`, it is just an impl detail.

### Steps to Reproduce

Use `ActivityScenario` to launch a flow, call `intended(..)` on all the activities in the flow, then call `Intents.assertNoUnverifiedIntents()`

### Expected Results

no failure.

### Actual Results

```
Caused by: junit.framework.AssertionFailedError: Found unverified intents.

Unverified intents:
-Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10008000 cmp=com.example.test/androidx.test.core.app.InstrumentationActivityInvoker$BootstrapActivity (has extras) } handling packages:[[com.example.test]], extras:[Bundle[{androidx.test.core.app.InstrumentationActivityInvoker.TARGET_ACTIVITY_OPTIONS_BUNDLE_KEY=null, androidx.test.core.app.InstrumentationActivityInvoker.START_TARGET_ACTIVITY_INTENT_KEY=PendingIntent{47de493: android.os.BinderProxy@1f14cd0}}]])

Recorded intents:
-Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10008000 cmp=com.example.test/androidx.test.core.app.InstrumentationActivityInvoker$BootstrapActivity (has extras) } handling packages:[[com.example.test]], extras:[Bundle[{androidx.test.core.app.InstrumentationActivityInvoker.TARGET_ACTIVITY_OPTIONS_BUNDLE_KEY=null, androidx.test.core.app.InstrumentationActivityInvoker.START_TARGET_ACTIVITY_INTENT_KEY=PendingIntent{47de493: android.os.BinderProxy@1f14cd0}}]])
at junit.framework.Assert.fail(Assert.java:50)
at androidx.test.espresso.intent.VerificationModes$NoUnverifiedIntents.verify(VerificationModes.java:54)
at androidx.test.espresso.intent.Intents.internalIntended(Intents.java:348)
at androidx.test.espresso.intent.Intents$2.check(Intents.java:196)
at androidx.test.espresso.ViewInteraction$SingleExecutionViewAssertion.check(ViewInteraction.java:10)
at androidx.test.espresso.ViewInteraction$2.call(ViewInteraction.java:11)
at androidx.test.espresso.ViewInteraction$2.call(ViewInteraction.java:2)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
```

### AndroidX Test and Android OS Versions

Android X Test 1.3.0 and API 23

Start with Intents.assertNoUnverifiedIntents() and VerificationModes.NoUnverifiedIntents, then trace how the BootstrapActivity intent from ActivityScenario is recorded and checked. Reproduce the failure with the steps provided on Android X Test 1.3.0/API 23. Done means BootstrapActivity intents no longer cause assertNoUnverifiedIntents() to fail while other unverified intents still do.

Written by the indexing model from the issue text.