Add stress test for ATS to msaltestapp, Fixes AB#3404910

[rpdome]

AB#3404910

NOTE: in order for this to work, the build config shouldSkipSilentTokenCommandCacheForStressTest must be set to true.
Otherwise, the redundant requests will be absorbed by the CommandDispatcher cache and it won't be fired concurrently to broker.

See AzureAD/microsoft-authentication-library-common-for-android#2786)

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[Copilot]

Pull Request Overview

This PR adds concurrent stress testing functionality for AcquireTokenSilent operations to the MSAL Android test application. The feature allows testing how MSAL handles multiple simultaneous token acquisition requests.

Key Changes:

• Added UI controls for configuring concurrent execution parameters (thread count and total requests)
• Implemented a new ConcurrentAcquireTokenExecutor class to handle multi-threaded token acquisition with progress tracking
• Modified RequestOptions class visibility to support the new concurrent testing feature

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
fragment_acquire.xml	Added UI section with input fields and buttons for concurrent ATS testing
RequestOptions.java	Made class public and added getter method for configuration access
ConcurrentAcquireTokenExecutor.kt	New Kotlin class implementing concurrent token acquisition with progress callbacks
AcquireTokenFragment.java	Added concurrent execution logic and UI event handlers
common	Updated submodule reference