Split AzureDevOpsSummaryReporter into focused modules

[Amaury Levé (Evangelink)]

Summary

• split AzureDevOpsSummaryReporter into focused core, lifecycle/path, and Markdown partial modules
• preserve lifecycle ordering, cancellation/error handling, path resolution, test hooks, and Markdown rendering exactly
• keep every partial file below 300 lines with UTF-8 BOM

Validation

• Microsoft.Testing.Extensions.UnitTests passed on net462, net472, net8.0, and net9.0
• full repository pack succeeded
• all 9 HelpInfoAllExtensionsTests acceptance executions passed on net10.0
• two independent reviews confirmed exact moved-body equivalence, compile inclusion, path/lifecycle semantics, and encoding/line limits

Closes #10642

[Copilot]

Pull request overview

Splits AzureDevOpsSummaryReporter into focused partial-class modules without changing behavior.

Changes:

• Retains identity, dependencies, and metadata in the core file.
• Moves lifecycle/path handling and Markdown rendering into dedicated files.
• Keeps all partial files below 300 lines with UTF-8 BOM.

Show a summary per file

File	Description
AzureDevOpsSummaryReporter.cs	Defines the core partial class and metadata.
AzureDevOpsSummaryReporter.Lifecycle.cs	Contains session lifecycle and path-resolution logic.
AzureDevOpsSummaryReporter.Markdown.cs	Contains Markdown generation and formatting helpers.

Review details

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• Files reviewed: 3/3 changed files
• Comments generated: 0
• Review effort level: Balanced