Fix the test flakiness

[adamsitnik]

fixes #117172

[Copilot]

Pull Request Overview

This PR addresses test flakiness in the AssemblyNameInfo tests by simplifying the test cases and assertions on the culture name conversion.

• Removed platform‐dependent member data and conditional test attributes
• Replaced the expected lower-cased culture value with a computed value using CultureInfo to normalize output across frameworks

Comments suppressed due to low confidence (2)

src/libraries/System.Reflection.Metadata/tests/Metadata/AssemblyNameInfoTests.cs:108

• Ensure that the new inline test cases fully cover all scenarios previously addressed by the removed CultureNameGetLoweredByToAssemblyName_Arguments method. If there are additional edge cases to validate, consider adding them.

        }

src/libraries/System.Reflection.Metadata/tests/Metadata/AssemblyNameInfoTests.cs:122

• Using CultureInfo(input).Name as the expected value makes the test more robust across platforms; please confirm that this behavior is consistent across all targeted frameworks.

            Assert.Equal(new CultureInfo(input).Name, assemblyNameInfo.ToAssemblyName().CultureName);

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[stephentoub]

thanks.