Add custom AAR support to llm-android workflow

[Copilot]

Adds local_aar input field to llm-android.yml workflow for custom AAR files, matching the existing capability in android-build.yml.

Changes

• Workflow input: Added optional local_aar parameter accepting URL to custom AAR file
• Download step: Downloads AAR to app/libs/executorch.aar when URL provided
• Build integration: Passes -PuseLocalAar=true to Gradle when custom AAR specified
• Test script: Extended run-ci-tests.sh to accept and forward use_local_aar flag

Usage

workflow_dispatch:
  inputs:
    local_aar: 'https://example.com/path/to/executorch.aar'
    model_preset: 'llama'

When local_aar is set, the workflow downloads the AAR and builds against it instead of the Maven dependency org.pytorch:executorch-android:1.0.1.

Original prompt

For llm-android.yml can you add a field for custom AAR for apk build, similar to android-build.yml?

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