Get changes from V2.14+fall2025 to v2.15-beta1+winter-develop

[rquidute]

Get changes from V2.14+fall2025 to v2.15-beta1+winter-develop

[gemini-code-assist]

Summary of Changes

Hello @rquidute, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request synchronizes the project with changes from the V2.14+fall2025 branch into v2.15-beta1+winter-develop. It primarily updates the backend service's underlying code and Docker image, along with corresponding documentation. A critical improvement addresses potential issues with Docker installations by ensuring that docker-ce version 29.x is specifically avoided during dependency setup.

Highlights

• Backend Updates: The backend subproject and its corresponding Docker image have been updated to a newer commit (e20beac).
• Documentation Alignment: The Matter Test-Harness User Manual has been updated to reflect the v2.14+fall2025 version, including a new changelog entry and updated links.
• Docker Installation Fix: The Ubuntu dependency installation script now includes special handling for docker-ce to prevent the installation of version 29.x, which might cause compatibility issues.
• Dependency List Refinement: The package-dependency-list.txt file has been updated to explicitly exclude docker-ce versions 5:29.0 and above.

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[gemini-code-assist]

Code Review

This pull request updates the project to version v2.14+fall2025. The changes include updating the backend submodule and its corresponding Docker image, updating the user guide with the new version information, and modifying the dependency installation script to pin the docker-ce package to a version before 29.x to avoid issues. My review focuses on improving the installation script's logging and enhancing the user guide's changelog for better clarity. The changes are generally good and address a potential issue with a dependency.

[mergify]

⚠️ The sha of the head commit of this PR conflicts with #791. Mergify cannot evaluate rules on this PR. ⚠️