Fix: MonoRuntimeMixedModeExcludedAssembly ignored when WasmShellAOTProfileExcludedMethods unset (backport #1027)

[mergify]

• Understand the issue - MonoRuntimeMixedModeExcludedAssembly not working when used alone
• Identify root cause - incorrect parameter type in targets file (property vs item group)
• Fix the targets file to pass @(MonoRuntimeMixedModeExcludedAssembly) instead of $(WasmShellMixedModeExcludedAssembly)
• Create a test project that validates the fix using WasmShellGenerateAOTProfileDebugList
• Document the test with a README
• Run code review - passed with no comments
• Security checks - no security concerns (minimal change to MSBuild parameter passing)
• Add test to CI configuration with explicit publish steps
• Enhance validation to analyze profile content and verify assembly filtering works correctly
• Fix solution file configuration (add test to main .sln file)
• Fix validation target timing and remove from solution filter to avoid memory issues
• Fix test to actually use Newtonsoft.Json so methods are in the profile

Original prompt

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This section details on the original issue you should resolve

<issue_title>[AOT] MonoRuntimeMixedModeExcludedAssembly is not taken into account if WasmShellAOTProfileExcludedMethods is not specified</issue_title>
<issue_description>### Current behavior 🐛

MonoRuntimeMixedModeExcludedAssembly should be useable independently to filter the AOT profile.

Expected behavior 🎯

Profile filtering is properly enabled.

How to reproduce it (as minimally and precisely as possible) 🔬

No response

Workaround 🛠️

No response

Renderer 🎨

• Skia
• Native

Affected platforms 📱💻🖥️

No response

Uno.Sdk version (and other relevant versions) 📦

10.0.15

IDE version 🧑‍💻

No response

Anything else we need to know? 💬

No response</issue_description>

<agent_instructions>Make sure to add a new test that will validate this behavior using the WasmShellGenerateAOTProfileDebugList file generation, as a post build step.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes [AOT] MonoRuntimeMixedModeExcludedAssembly is not taken into account if WasmShellAOTProfileExcludedMethods is not specified #1026

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This is an automatic backport of pull request #1027 done by [Mergify](https://mergify.com).

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✅ jeromelaban
❌ Copilot
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