Update to AwesomeAssertions/.NET9#202

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CaptaiNiveau wants to merge 7 commits intoTestably:mainfrom

CaptaiNiveau:main

Commits on Sep 9, 2025

Moved to AwesomeAssertions and updated project name/nuget packages
CaptaiNiveau
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Use CurrentAssertionChain instead of Execute
CaptaiNiveau
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Add AssertionChain to constructors
CaptaiNiveau
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Pass on CurrentAssertionChain
CaptaiNiveau
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GetOrCreate AssertionChain in Extensions
CaptaiNiveau
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Propagate CurrentAssertionChain through Statistics (not sure about this one)
CaptaiNiveau
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Upgrade to .NET 9
CaptaiNiveau
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