Update xpc preasure test in MSAL mac test app

[kaisong1990]

Proposed changes

This pull request updates the MSALAcquireTokenViewController to support scheduled pressure testing using a timer. The main change is the addition of a timer-based mechanism to repeatedly execute a token acquisition task every 5 minutes when XPC pressure testing is enabled.

Pressure test automation:

• Added a new NSTimer property to the MSALAcquireTokenViewController to manage scheduled tasks.
• Implemented logic in acquireTokenSilent: to schedule a timer that fires every 5 minutes, executing a block that performs a series of token acquisition requests. The block now runs 5 iterations instead of 100 for each timer event. [1] [2]
• Added a handleTimer: method to invoke the scheduled task block when the timer fires.

Type of change

• Feature work
• Bug fix
• Documentation
• Engineering change
• Test
• Logging/Telemetry

Risk

• High – Errors could cause MAJOR regression of many scenarios. (Example: new large features or high level infrastructure changes)
• Medium – Errors could cause regression of 1 or more scenarios. (Example: somewhat complex bug fixes, small new features)
• Small – No issues are expected. (Example: Very small bug fixes, string changes, or configuration settings changes)

Additional information

[Copilot]

Pull Request Overview

This pull request updates the XPC pressure testing functionality in the MSAL Mac test app to use a scheduled timer approach instead of a blocking loop. The change improves the testing mechanism by reducing the number of iterations per execution and spreading them out over time.

• Replaces blocking loop with NSTimer-based scheduling for pressure tests
• Reduces iterations from 100 to 5 per execution cycle
• Adds timer management with 5-minute intervals

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