Restore E2EESanityTests after correcting Realm issues.

Originally ignored in #6099

```
05-19 11:06:36.947 22885 22885 E AndroidJUnitRunner: An unhandled exception was thrown by the app.
05-19 11:06:36.948 22885 23026 I System.out: V/DefaultTimeline: Post snapshot of 11 events
05-19 11:06:36.972 22885 22885 I AndroidJUnitRunner: Bringing down the entire Instrumentation process.
05-19 11:06:36.980 22885 22885 E MonitoringInstr: Exception encountered by: Thread[main,5,main]. Dumping thread state to outputs and pining for the fjords.
05-19 11:06:36.980 22885 22885 E MonitoringInstr: java.lang.IllegalStateException: This Realm instance has already been closed, making it unusable.
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at io.realm.BaseRealm.checkIfValid(BaseRealm.java:524)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at io.realm.org_matrix_android_sdk_internal_database_model_TimelineEventEntityRealmProxy.realmGet$isUniqueDisplayName(org_matrix_android_sdk_internal_database_model_TimelineEventEntityRealmProxy.java:349)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at org.matrix.android.sdk.internal.database.model.TimelineEventEntity.isUniqueDisplayName(TimelineEventEntity.kt:32)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at org.matrix.android.sdk.internal.database.mapper.TimelineEventMapper.map(TimelineEventMapper.kt:46)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at org.matrix.android.sdk.internal.database.mapper.TimelineEventMapper.map$default(TimelineEventMapper.kt:27)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at org.matrix.android.sdk.internal.session.room.timeline.RealmSendingEventsDataSource.buildSendingEvents(SendingEventsDataSource.kt:88)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at org.matrix.android.sdk.internal.session.room.timeline.LoadTimelineStrategy.buildSendingEvents(LoadTimelineStrategy.kt:262)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at org.matrix.android.sdk.internal.session.room.timeline.LoadTimelineStrategy.buildSnapshot(LoadTimelineStrategy.kt:242)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at org.matrix.android.sdk.internal.session.room.timeline.DefaultTimeline.getSnapshot(DefaultTimeline.kt:201)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at org.matrix.android.sdk.internal.crypto.E2eeSanityTests$sendMessageInRoom$1$1.invoke(E2eeSanityTests.kt:593)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at org.matrix.android.sdk.internal.crypto.E2eeSanityTests$sendMessageInRoom$1$1.invoke(E2eeSanityTests.kt:592)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at org.matrix.android.sdk.common.CommonTestHelper.retryPeriodicallyWithLatch(CommonTestHelper.kt:390)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at org.matrix.android.sdk.common.CommonTestHelper$retryPeriodicallyWithLatch$1.invokeSuspend(Unknown Source:15)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at kotlinx.coroutines.DispatchedTaskKt.resume(DispatchedTask.kt:234)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at kotlinx.coroutines.DispatchedTaskKt.dispatch(DispatchedTask.kt:166)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at kotlinx.coroutines.CancellableContinuationImpl.dispatchResume(CancellableContinuationImpl.kt:397)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at kotlinx.coroutines.CancellableContinuationImpl.resumeImpl(CancellableContinuationImpl.kt:431)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at kotlinx.coroutines.CancellableContinuationImpl.resumeImpl$default(CancellableContinuationImpl.kt:420)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at kotlinx.coroutines.CancellableContinuationImpl.resumeUndispatched(CancellableContinuationImpl.kt:518)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at kotlinx.coroutines.android.HandlerContext$scheduleResumeAfterDelay$$inlined$Runnable$1.run(Runnable.kt:19)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at android.os.Handler.handleCallback(Handler.java:873)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at android.os.Handler.dispatchMessage(Handler.java:99)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at android.os.Looper.loop(Looper.java:193)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at android.app.ActivityThread.main(ActivityThread.java:6669)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at java.lang.reflect.Method.invoke(Native Method)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
05-19 11:06:36.980 22885 22885 E MonitoringInstr: Suppressed: kotlinx.coroutines.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@9293d3c, Dispatchers.Main]

```
This unhandled exception terminates the run and can't be caught in a retry block (as the exception goes straight up to the test running framework, not via any catch blocks in the test) so ignoring is the only way.