Adding debugger step-through attributes to static helpers

[rcj1]

#110709

[Copilot]

Pull Request Overview

This PR adds debugging attributes to internal methods to improve debugger stepping behavior by automatically hiding and stepping through them.

• Applies [DebuggerHidden] and [DebuggerStepThrough] to thread-local and runtime helper methods.
• Affects CoreCLR threading and runtime compiler services code.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/coreclr/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs	Added debugger attributes to GetThreadStaticsBase
src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/RuntimeHelpers.CoreCLR.cs	Added debugger attributes to several helper methods

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[steveisok]

Congrats on your first runtime PR!

[hoyosjs]

#116671 is the WASM failure