chore: expose MachineId

[rajamatt]

GitHub Issue (If applicable): for https://github.com/unoplatform/uno-private/issues/1513

PR Type

What kind of change does this PR introduce?

Exposing the MachineId of the Telemetry client so we can track it externally in apps.

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs
• Docs have been added/updated which fit documentation template. (for bug fixes / features)
• Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• Wasm UI Tests are not showing unexpected any differences. Validate PR Screenshots Compare Test Run results.
• Contains NO breaking changes
• Updated the Release Notes
• Associated with an issue (GitHub or internal)

[rajamatt]

@jeromelaban is there a better way to expose or get the MachineId? This is for work in https://github.com/unoplatform/uno-private/issues/1513 (where we would identify the user based on their MachineId)

[Copilot]

Pull Request Overview

This PR exposes the MachineId from the Telemetry client to enable external tracking in applications. The change adds a new asynchronous method to retrieve the machine ID that was previously only used internally.

• Adds a GetMachineIdAsync method to both the interface and implementation
• Uses a TaskCompletionSource to handle the asynchronous nature of machine ID initialization

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/Uno.DevTools.Telemetry/ITelemetry.cs	Adds GetMachineIdAsync method signature to the interface
src/Uno.DevTools.Telemetry/Telemetry.cs	Implements GetMachineIdAsync with TaskCompletionSource for async coordination

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