[iOS][non-icu] HybridGlobalization rafactor condition checks / clean up the code

[mkhamoyan]

• Define APPLE_HYBRID_GLOBALIZATION symbol for the 3 OSes and use it throughout the implementation instead of defined(TARGET_MACCATALYST) || defined(TARGET_IOS) || defined(TARGET_TVOS) conditions in all files under https://github.com/dotnet/runtime/tree/main/src/native/libs/System.Globalization.Native
• HybridGlobalization is supported only on iOS/tvOS/macCatalyst not OSX. Rename IsHybridGlobalizationOnOSX / IsNotHybridGlobalizationOnOSX to IsHybridGlobalizationOnApplePlatform / IsNotHybridGlobalizationOnApplePlatform https://github.com/dotnet/runtime/blob/main/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs#L384.
• Remove IsIcuGlobalizationAndNotHybrid property
• Check if possible to include "pal_utilities.h" in pal_placeholders.h instead of defining asserts, look discussion [HybridGlobalization] Include all globalization symbols #96684 (comment)
  we shouldn't mix our configs with pal_config.h.in, so we will keep the way it was implemented.

Contributes to #80689

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Issue Details

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• Define APPLE_HYBRID_GLOBALIZATION symbol for the 3 OSes and use it throughout the implementation instead of defined(TARGET_MACCATALYST) || defined(TARGET_IOS) || defined(TARGET_TVOS) conditions in all files under https://github.com/dotnet/runtime/tree/main/src/native/libs/System.Globalization.Native
• HybridGlobalization is supported only on iOS/tvOS/macCatalyst not OSX. Rename IsHybridGlobalizationOnOSX / IsNotHybridGlobalizationOnOSX to IsHybridGlobalizationOniOS / IsNotHybridGlobalizationOniOS https://github.com/dotnet/runtime/blob/main/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs#L384.

Contributes to #80689

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

[jkotas]

IsHybridGlobalizationOniOS

This should be IsHybridGlobalizationOnApplePlatform. It returns true on more OSes, not just iOS. The name does not need to encode the fact that the hybrid globalization is not available in macOS build currently.