[AutoRelease] t2-containerservicefleet-2025-04-02-13338(can only be merged by SDK owner)

[azure-sdk]

https://github.com/Azure/sdk-release-request/issues/5987
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[azure-sdk]

issue link:https://github.com/Azure/sdk-release-request/issues/5987

[Copilot]

Pull Request Overview

This PR releases version 3.1.0 of the SDK and introduces new auto upgrade related models, enums, and operation groups while updating API version defaults and minor documentation issues. Key changes include:

• Addition of new auto upgrade models and enums (e.g. AutoUpgradeLastTriggerStatus, AutoUpgradeProfile, UpgradeChannel) and the new operation groups auto_upgrade_profiles and auto_upgrade_profile_operations.
• Updates to type annotations and configuration defaults (e.g. API version changed from 2024-04-01 to 2025-03-01) along with version bump and README/CHANGELOG updates.
• Minor code and pylint directive adjustments in various operations and serialization modules.

Reviewed Changes

Copilot reviewed 103 out of 104 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
models/_container_service_fleet_mgmt_client_enums.py	Adds new enums and updated the NodeImageSelectionType with a new member CUSTOM.
models/init.py	Updates all to include new auto upgrade models and enums.
aio/operations/*	Removes some redundant pylint disables and updates error_map type annotations uniformly.
_container_service_fleet_mgmt_client.py (sync & async)	Introduces new operation groups for auto upgrade profiles and updates client docstrings.
_configuration.py	Updates API version defaults and client configuration documentation.
_version.py, README.md, CHANGELOG.md	Bumps version to 3.1.0 and improves documentation consistency.
_serialization.py	Enhances type hints, error messages, and minor formatting improvements.

Files not reviewed (1)

• sdk/containerservice/azure-mgmt-containerservicefleet/_meta.json: Language not supported

Comments suppressed due to low confidence (2)

sdk/containerservice/azure-mgmt-containerservicefleet/azure/mgmt/containerservicefleet/aio/operations/_auto_upgrade_profile_operations_operations.py:40

• [nitpick] The class name 'AutoUpgradeProfileOperationsOperations' is repetitive and may reduce clarity. Consider renaming it to 'AutoUpgradeProfileOperations' if it does not conflict with existing names.

class AutoUpgradeProfileOperationsOperations:

sdk/containerservice/azure-mgmt-containerservicefleet/azure/mgmt/containerservicefleet/aio/operations/_update_runs_operations.py:94

• [nitpick] The explicit generic type for 'error_map' was removed; reinstating the type parameters (e.g., MutableMapping[int, Type[HttpResponseError]]) could improve type clarity and safety.

error_map: MutableMapping = {

[msyyc]

@frantran please update the date to latest when you decide to merge and release.