[iOS][non-icu] HybridGlobalization investigate behavioural changes

[mkhamoyan]

• [x] Go through test cases market as ActiveIssue for PlatformDetection. IsHybridGlobalizationOnApplePlatform in https://github.com/dotnet/runtime/blob/main/src/libraries/Common/tests/Tests/System/StringTests.cs and investigate if possible to have same behaviour as ICU compare.

• [ ] Check Turkish 'I' comparison and check "\u0131" casing.

  • For ICU, we have similar logic implemented at https://github.com/dotnet/runtime/blob/01aa3d96bb2160144f167b1065e081521d133b48/src/native/libs/System.Globalization.Native/pal_casing.c#L135
  • and https://github.com/dotnet/runtime/blob/01aa3d96bb2160144f167b1065e081521d133b48/src/native/libs/System.Globalization.Native/pal_casing.c#L91

• [ ] Check DateTime related behavioural changes.

In case not possible document behavioural differencies between ICU and Hybrid.

Tests have been marked as ActiveIssue in hybrid mode here https://github.com/dotnet/runtime/pull/95260

• https://github.com/search?q=repo%3Adotnet%2Fruntime+https%3A%2F%2Fgithub.com%2Fdotnet%2Fruntime%2Fissues%2F95338&type=code

Contributes to https://github.com/dotnet/runtime/issues/80689

[ghost]

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Issue Details

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Go through test cases market as `ActiveIssue` for `PlatformDetection.IsNotHybridGlobalizaionOnOSX` in https://github.com/dotnet/runtime/blob/main/src/libraries/Common/tests/Tests/System/StringTests.cs and investigate if possible to have same behaviour as ICU compare. In case not possible document behavioural differencies between `ICU` and `Hybrid`. Tests have been marked as `ActiveIssue` in hybrid mode here https://github.com/dotnet/runtime/pull/95260 Contributes to https://github.com/dotnet/runtime/issues/80689

Author:	mkhamoyan
Assignees:	mkhamoyan
Labels:	`area-System.Globalization`, `os-ios`
Milestone:	9.0.0