Android GodotPlugin emitSignal seems to be leaking memory

### Tested versions

- Reproducible using maven dependency `org.godotengine:godot:4.2.1.stable`

### System information

Android SDK 28-32 at least, Godot 4.2.1, emulator, and real hardware, Compatibility mode

### Issue description

Sending a large image as a bytearray via the emitSignal mechanism causes a noticeable memory increase that never is deallocated.

I think it is a general issue with `emitSignal`, no matter the type of data sent but no evidence besides the one with the large bytearray.

### Steps to reproduce

call `GodotPlugin.emitsignal` passing a large bytearray as parameter. with the android profiler running, try to force a GC notice the memory does not go down.


The bumps in the image are caused by the emit signal function called on a button handler (pink dot) the GC event was forced, notice nothing was collected.

_Update_

Calling `PackedArray.clear` on GDScript side reduces de memory consumption, but I think the reference is still alive and will not be collected.

### Minimal reproduction project (MRP)

[empty-godot-project-main.zip](https://github.com/godotengine/godot/files/14969352/empty-godot-project-main.zip)

also put on a [repo](https://github.com/spacetug/empty-godot-project)

Start with the attached minimal reproduction project and Android profiler, invoking GodotPlugin.emitSignal with a large bytearray and forcing GC. Trace the emitSignal path and compare memory after PackedArray.clear; done means the large allocation is released after collection.

Written by the indexing model from the issue text.