fix: Use OperatingSystem.IsXyz instead of RuntimeInformation.IsOSPlatform

[Jklawreszuk]

PR Details

Description

PR replaces all occurrences of IsOSPlatform in favor of the more modern OperatingSystem.IsXyz available in NET5+.

Related Issue

None

Motivation and Context

The main motivation is less preprocessor directives and modernizing the code. In theory, methods should be faster because they are constants

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My change requires a change to the documentation.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I have built and run the editor to try this change out.

[Eideren]

Thanks !