Bump NCS revision to v3.1.0

[LuDuda]

This commit updates NCS revision to v3.1.0 and switches firmware builds to use nrfutil and toolchain-manager instead of a manually installed ARM toolchain.

[gemini-code-assist]

Summary of Changes

Hello @LuDuda, 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 focuses on upgrading the nRF Connect SDK (NCS) to version 3.1.0 and significantly refactoring the firmware build system. The core change involves transitioning from a manual ARM toolchain setup to an automated process leveraging nrfutil and toolchain-manager. This modernization aims to simplify dependency management, streamline the build environment, and ensure compatibility with the latest NCS features. The update also includes minor adjustments to OpenThread configurations.

Highlights

• NCS Version Bump: The nRF Connect SDK (NCS) version has been updated to v3.1.0, reflecting a significant upgrade in the underlying development environment.
• Toolchain Management Integration: The firmware build process has been modernized by switching from a manually installed ARM toolchain to using nrfutil and toolchain-manager. This streamlines toolchain setup and management.
• Build Process Simplification: The build script now automatically handles the installation of necessary build dependencies and Python requirements through the new toolchain management system, simplifying the setup process and reducing manual configuration.
• OpenThread Configuration Update: A minor configuration change was made in the OpenThread common overlay, enabling CONFIG_OPENTHREAD and removing CONFIG_OPENTHREAD_L2_DEBUG.

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[gemini-code-assist]

Code Review

This pull request updates the NCS revision to v3.1.0 and refactors the firmware build process to use nrfutil and toolchain-manager. The changes are a good step towards simplifying the toolchain setup. I have provided a few suggestions to improve maintainability by removing a redundant configuration and avoiding hardcoded version strings in the build script. Please see the detailed comments below.

[Copilot]

Pull Request Overview

This PR updates the NCS (Nordic Connect SDK) revision from a specific commit hash to version v3.1.0 and modernizes the build process by replacing manual ARM toolchain installation with nrfutil's toolchain-manager.

• Updates NCS version from commit hash to v3.1.0 tag
• Replaces manual ARM GCC toolchain setup with nrfutil toolchain-manager
• Removes deprecated dependency installations and Python requirements setup

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
script/make-firmware.bash	Adds nrfutil toolchain management and removes manual toolchain setup
config/ncs/sdk-nrf-commit	Updates NCS version reference from commit hash to v3.1.0
config/ncs/overlay-ot-cli-ftd-common.conf	Adds CONFIG_OPENTHREAD=y and removes CONFIG_OPENTHREAD_L2_DEBUG=y
.github/workflows/build.yml	Removes manual ARM toolchain download and environment setup

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