[browser][non-icu] HybridGlobalization normalization unblocking APIs that became supported.

[ilonatommy]

In non-hybrid globalization we are not supporting normalization forms: KD and KC.
In the hybrid mode, both forms are supported and we need them for implemenation of hybrid IDN/ACE mapping.
This PR is changing the public API behavior by enabling both forms on Browser platform. When the HybridGlobalziation (that is an opt-in feature) is switched off and the user is not in InvariantGlobalization mode, they will get PNSE exception when they try to use KD/KC. It is asured by validation in

runtime/src/libraries/System.Private.CoreLib/src/System/Globalization/Normalization.Icu.cs

Line 107 in c368b3d

thrownewPlatformNotSupportedException();

Contributes to #79989.

@lewing this PR changes the behavior: from failing in the build to failing during runtime when KD/KC forms are used.

[ghost]

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Issue Details

---

In non-hybrid globalization we are not supporting nromalization forms: KD and KC.
In the hybrid mode, both forms are supported and we need them for implemenation of hybrid IDN/ACE mapping.
This PR is changing the public API behavior by enabling both forms on Browser platform. When the HybridGlobalziation (that is an opt-in feature) is switched off and the user is not in InvariantGlobalization mode, they will get PNSE exception when they try to use KD/KC. It is asured by validation in

runtime/src/libraries/System.Private.CoreLib/src/System/Globalization/Normalization.Icu.cs

Line 107 in c368b3d

thrownewPlatformNotSupportedException();

Author:	ilonatommy
Assignees:	ilonatommy
Labels:	arch-wasm, area-System.Globalization
Milestone:	-

[tarekgh]

Looks you need a small tweak to this fix?

/__w/1/s/src/libraries/System.Private.CoreLib/src/System/Globalization/Normalization.Icu.cs(104,36): error CS0117: 'GlobalizationMode' does not contain a definition for 'Hybrid' [/__w/1/s/src/coreclr/System.Private.CoreLib/System.Private.CoreLib.csproj]
##[error]src/libraries/System.Private.CoreLib/src/System/Globalization/Normalization.Icu.cs(104,36): error CS0117: (NETCORE_ENGINEERING_TELEMETRY=Build) 'GlobalizationMode' does not contain a definition for 'Hybrid'

[ilonatommy]

Drafting till we:

• will be able to provide unified behavior for non-hybrid and hybrid mode e.g. by adding more data to ICU, we could leverage custom ICU build [browser][icu] Automate custom icu creation #82908
  OR
• introduce code analysis that will detect HybridGlobalization mode, so we could preserve failing the build for non-hybrid mode.

[ilonatommy]

Closing - normalization is getting reverted with #87007