[Fabric] Implement onProgress for Image

[anupriya13]

Description

Type of Change

• New feature (non-breaking change which adds functionality)

Why

What is the motivation for this change? Add a few sentences describing the context and overall goals of the pull request's commits.

Implement the onProgress property for the fabric implementation of Image.

Note: At one point there was a TODO for this in our new fabric code.

This property was not available in RNW Paper but could be implemented for Fabric.

See https://reactnative.dev/docs/image#onprogress for details.

Resolves #13118 and #13752

What

What changes were made to the codebase to solve the bug, add the functionality, etc. that you specified above.

Added a progress Callback during request start for image downloading that keeps track of progress and invokes observerCoordinator->nativeImageResponseProgress

Refer:
https://learn.microsoft.com/en-us/uwp/api/windows.web.http.httpstringcontent.writetostreamasync?view=winrt-26100
https://learn.microsoft.com/en-us/uwp/api/windows.web.http.httpstringcontent.readasinputstreamasync?view=winrt-26100

Key Differences between ReadAsInputStreamAsync and WriteToStreamAsync:

Aspect	ReadAsInputStreamAsync + Manual Loop	WriteToStreamAsync
Control	✅ Full control over buffer size, read/write logic, progress reporting, cancellation	❌ Black-box – you don’t control how reading/writing is done internally
Progress Reporting	✅ You can track progressCallback(progress, total) manually	❌ No built-in way to hook into progress during transfer
Customization	✅ Can add error handling, retries, filters, stalls, compression, etc.	❌ Not customizable, does an internal streaming copy
Code Simplicity	❌ More verbose	✅ One-liner – cleaner if you don’t need control
Performance	Slightly more overhead due to manual buffering	Likely optimized under the hood, but not significantly different

Screenshots

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Testing

If you added tests that prove your changes are effective or that your feature works, add a few sentences here detailing the added test scenarios.

1. Tested in playground composition adding the onProgress event call with large and small size image.
2. Tested in RNWTester e2e fabric test app, testID: image-network-callback and image-network. 'An Image component can have a network callback' and 'A network Image example'

Optional: Describe the tests that you ran locally to verify your changes.

Changelog

Should this change be included in the release notes: indicate yes or no
Yes

Add a brief summary of the change to use in the release notes for the next release.
Implemented onProgress event for Image in Fabric new architecture.
Invoked on download progress.

Microsoft Reviewers: Open in CodeFlow