Fix instrumented tests

Comes from https://github.com/Automattic/simplenote-android/pull/1733/files#r2253935365

> 2. Warning (⚠️): In addition to having unit test working, let's consider having instrumented tests working as well, in this or another follow-up PR (if not too much of a trouble). On that side of things I have the following:
> 1. First, we need to add this `androidTestImplementation 'androidx.test.uiautomator:uiautomator:2.3.0'` dependency to have those instrumented tests compile.
> 2. Then, we need to use `./gradlew Simplenote:connectedDebugAndroidTest` over `./gradlew connectedDebugAndroidTest` to make them run, because otherwise compilation fails on the `PasscodeLock` module with multiple duplicate class failures on Kotlin (we might consider getting to the bottom of this).
> 3. Finally, after managing to run instrumented tests successfully, you'll find that at least `13/74` fail.

Start with the instrumented-test setup referenced in the pull request discussion and the PasscodeLock module. Add the stated UI Automator test dependency, run ./gradlew Simplenote:connectedDebugAndroidTest, and inspect the 13 failing tests among the 74 reported. Done means the instrumented tests compile and run without duplicate-class failures, with the identified failures resolved.

Written by the indexing model from the issue text.