Don't leak MediaFileHandle when downloading voice messages (#1748)

Uses the new `MediaFile.persist()` [API](https://github.com/matrix-org/matrix-rust-sdk/pull/2789) to cache voice messages.
This allows to close the `MediaFile` handle after use and keeping the file.
Also disables rust sdk caching for voice messages as we'll use the app's cache dir for that purpose.

Fixes: https://github.com/vector-im/element-meta/issues/2175

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/voicemessages/timeline/VoiceMessageMediaRepo.kt

@@ -24,7 +24,6 @@ import io.element.android.libraries.di.CacheDirectory
 import io.element.android.libraries.di.RoomScope
 import io.element.android.libraries.matrix.api.media.MatrixMediaLoader
 import io.element.android.libraries.matrix.api.media.MediaSource
-import io.element.android.libraries.matrix.api.media.toFile
 import java.io.File
 
 /**
@@ -90,14 +89,15 @@ class DefaultVoiceMessageMediaRepo @AssistedInject constructor(
             source = mediaSource,
             mimeType = mimeType,
             body = body,
+            useCache = false,
         ).mapCatching {
-            val dest = cachedFile.apply { parentFile?.mkdirs() }
-            // TODO By not closing the MediaFile we're leaking the rust file handle here.
-            // Not that big of a deal but better to avoid it someday.
-            if (it.toFile().renameTo(dest)) {
-                dest
-            } else {
-                error("Failed to move file to cache.")
+            it.use { mediaFile ->
+                val dest = cachedFile.apply { parentFile?.mkdirs() }
+                if (mediaFile.persist(dest.path)) {
+                    dest
+                } else {
+                    error("Failed to move file to cache.")
+                }
             }
         }
     }