Fix various lint warnings (#4409)

- Remove empty file `ExampleInstrumentedTest.java`.
- Replace deprecated `MigrationTestHelper` constructor call.
- Add reified inline extension methods for `Bundle` and `Intent` to
retrieve `Parcelable` and `Serializable` objects by calling the core
`BundleCompat` and `IntentCompat` methods, to allow shorter syntax and
removing the need to pass the class explicitly.
- Replace deprecated `drawable.setColorFilter()` with simpler
`drawable.setTint()` (uses blend mode `SRC_IN` by default, has the same
effect as `SRC_ATOP` when the source is a color).
- Rename shadowed variables (mostly caught exceptions).
- Remove unnecessary `.orEmpty()` on non-null fields.
- Replace `.size() == 0` with `.isEmpty()`.
- Prevent `NullPointerException` when `account.getDisplayName()` is
`null` in `StatusBaseViewHolder.setDisplayName()`.
- Declare `customEmojis` argument as non-null in
`StatusBaseViewHolder.setDisplayName()` because it calls
`CustomEmojiHelper.emojify()` which now requires it to be non-null.
- Prevent `NullPointerException` when no matching filter is found in
`StatusBaseViewHolder.setupFilterPlaceholder()`.
- Remove deprecated call to `setTargetFragment()` (target fragment is
not used anyway).
- Remove deprecated call to `isUserVisibleHint()` and test if the view
has been destroyed instead.
- Remove some unused imports.
- Remove unnecessary casts.
- Rename arguments to supertype names when a warning is shown.
- Prevent a potential memory leak by clearing the
`toolbarVisibilityDisposable` reference in `onDestroyView()`.

app/src/main/java/com/keylesspalace/tusky/ViewMediaActivity.kt

@@ -40,7 +40,6 @@ import android.widget.Toast
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.core.app.ShareCompat
 import androidx.core.content.FileProvider
-import androidx.core.content.IntentCompat
 import androidx.fragment.app.FragmentActivity
 import androidx.lifecycle.lifecycleScope
 import androidx.viewpager2.adapter.FragmentStateAdapter
@@ -54,6 +53,7 @@ import com.keylesspalace.tusky.fragment.ViewImageFragment
 import com.keylesspalace.tusky.fragment.ViewVideoFragment
 import com.keylesspalace.tusky.pager.ImagePagerAdapter
 import com.keylesspalace.tusky.pager.SingleImagePagerAdapter
+import com.keylesspalace.tusky.util.getParcelableArrayListExtraCompat
 import com.keylesspalace.tusky.util.getTemporaryMediaFilename
 import com.keylesspalace.tusky.util.startActivityWithSlideInAnimation
 import com.keylesspalace.tusky.util.submitAsync
@@ -118,11 +118,7 @@ class ViewMediaActivity :
         supportPostponeEnterTransition()
 
         // Gather the parameters.
-        attachments = IntentCompat.getParcelableArrayListExtra(
-            intent,
-            EXTRA_ATTACHMENTS,
-            AttachmentViewData::class.java
-        )
+        attachments = intent.getParcelableArrayListExtraCompat(EXTRA_ATTACHMENTS)
         val initialPosition = intent.getIntExtra(EXTRA_ATTACHMENT_INDEX, 0)
 
         // Adapter is actually of existential type PageAdapter & SharedElementsTransitionListener