Put LogExceptionThrown on the NativeRuntimeEventSource plan

[MichalStrehovsky]

This unifies LogExceptionThrown with the other eventing that is implemented in the native runtime (threads/threadpool).

Noticed this in #107418 (comment) where we run an awful lot of code in situations where event source is not even enabled.

Cc @dotnet/ilc-contrib

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[Copilot]

Pull Request Overview

This PR unifies the exception logging mechanism with the native runtime event system to improve performance by avoiding unnecessary code execution when event sources are disabled. The change moves from a direct runtime import call to using the NativeRuntimeEventSource pattern, which includes proper event source enablement checks.

Key Changes:

• Implements ExceptionThrown_V1 event in the NativeRuntimeEventSource with proper enablement checks
• Replaces direct runtime import calls with the new event source method
• Updates the native runtime implementation to match the new signature

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
NativeRuntimeEventSource.Exceptions.NativeSinks.cs	Adds the main ExceptionThrown_V1 event method with enablement check for NativeAOT
NativeRuntimeEventSource.Exceptions.NativeSinks.Internal.cs	Defines the LibraryImport for the native QCall implementation
System.Private.CoreLib.Shared.projitems	Registers the new exception event files in the build system
NativeRuntimeEventSourceGenerator.cs	Excludes the manually implemented exception event from code generation
RuntimeImports.cs	Removes the old direct runtime import for exception logging
Exception.NativeAot.cs	Updates exception logging to use the new event source method with enablement check
runtimeeventinternal.cpp	Updates native implementation signature to include flags and ClrInstanceID parameters
disabledruntimeeventinternal.cpp	Updates disabled runtime signature to match the new parameters

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[jkotas]

Thanks!