[evaluation] chore: Enable testing on 3.14

[kdestin]

Description

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• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
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Testing Guidelines

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[Copilot]

Pull request overview

This PR enables Python 3.14 testing for the Azure AI Evaluation SDK by adding a test configuration and removing the version filter that was previously excluding Python 3.14 from CI runs. The changes prepare the SDK for forward compatibility testing with upcoming Python releases.

Key Changes:

• Added Ubuntu 24.04 Python 3.14 test configuration to the platform matrix
• Removed MatrixFilters that excluded Python 3.14 from testing
• Removed outdated comments about azure-ai-ml Python 3.13 support issues

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
sdk/evaluation/platform-matrix.json	Added new test configuration for Python 3.14 on Ubuntu 24.04 with coverage disabled
sdk/evaluation/ci.yml	Removed MatrixFilters exclusion for Python 3.14 and cleaned up outdated comments