[Windows] WindowDecorations related integration tests

[maxkatz6]

What does the pull request do?

1. Enabled avalonia name source generator in integration tests project.
2. Implements basic TitleBarAutomationNode.
3. Creates some basic tests for WindowDecorations:

• Toggling window decorations shouldn't change window size. (disabled, as it's broken right now)
• Client-side chrome title bar height tests.
• Server-side chrome title bar height tests.
• Client-side chrome title bar height tests for a new window. This test is failing if Win32 - Fix EntendClient hints not being applied window show #15552 is reverted.

No macOS tests for now. Maybe in another PR Done.

What is the current behavior?

No tests. Only manual, only hardcore.

What is the updated/expected behavior with this PR?

I can sleep better. A little bit.

Checklist

• Added unit tests (if possible)?
• Added XML documentation to any related classes?
• Consider submitting a PR to https://github.com/AvaloniaUI/avalonia-docs with user documentation

Fixed issues

Tests #15532
Tests #15522
Tests #15552

[avaloniaui-bot]

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[avaloniaui-bot]

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[avaloniaui-bot]

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[avaloniaui-bot]

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[avaloniaui-bot]

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[avaloniaui-bot]

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[robloo]

This is great! Thanks for taking the time to add these!

[grokys]

Thanks @maxkatz6, sorry it took so long to get to this.

[avaloniaui-bot]

You can test this PR using the following package version. 11.2.999-cibuild0049478-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]