[tests][exceptions] Abbreviate long native test path

[mdh1418]

Should partially mitigate #110407

UnhandledExceptionHandler/ForeignThreadRevPInvokeUnhandled/ForeignThreadRevPInvokeUnhandled.*
to
UnhandledExceptionHandler/Foreign/ForeignUnhandled.*

UnhandledExceptionHandler/PInvokeRevPInvokeUnhandled/PInvokeRevPInvokeUnhandled.*
to
UnhandledExceptionHandler/PInvoke/PInvokeUnhandled.*

Testing

PS C:\Users\mihw\source\repos\mdh1418\runtime\latest> .\artifacts\tests\coreclr\windows.x64.Debug\baseservices\exceptions\UnhandledExceptionHandler\PInvoke\PInvokeUnhandled\PInvokeUnhandled.cmd
BEGIN EXECUTION
 "C:\Users\mihw\source\repos\mdh1418\runtime\latest\artifacts\tests\coreclr\windows.x64.Debug\Tests\Core_Root\\corerun.exe" -p "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization=true"  PInvokeUnhandled.dll 
Expected: 100
Actual: 100
END EXECUTION - PASSED
PASSED
PS C:\Users\mihw\source\repos\mdh1418\runtime\latest> .\artifacts\tests\coreclr\windows.x64.Debug\baseservices\exceptions\UnhandledExceptionHandler\Foreign\ForeignUnhandled\ForeignUnhandled.cmd
BEGIN EXECUTION
 "C:\Users\mihw\source\repos\mdh1418\runtime\latest\artifacts\tests\coreclr\windows.x64.Debug\Tests\Core_Root\\corerun.exe" -p "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization=true"  ForeignUnhandled.dll 
Expected: 100
Actual: 100
END EXECUTION - PASSED
PASSED

[Copilot]

Pull Request Overview

This PR shortens native test paths by renaming CMake projects, native libraries, DllImport references, and corresponding C# classes to more concise names under the UnhandledExceptionHandler tests.

• Rename foreignunhandled → unhandlednative for the generic unhandled test
• Remove old PInvokeRevPInvokeUnhandled and ForeignThreadRevPInvokeUnhandled tests, replacing them with PInvokeUnhandled and ForeignUnhandled variants
• Update CMakeLists, .csproj, and C# sources to reflect the new native library and class names

Reviewed Changes

Copilot reviewed 10 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/tests/baseservices/exceptions/unhandled/unhandled.cs	DllImport and native library name updated
src/tests/baseservices/exceptions/unhandled/CMakeLists.txt	CMake project and target renamed
src/tests/baseservices/exceptions/UnhandledExceptionHandler/PInvokeRevPInvokeUnhandled	Removed obsolete CMakeLists
src/tests/baseservices/exceptions/UnhandledExceptionHandler/PInvoke/PInvokeUnhandled.csproj	Update source file reference in project
src/tests/baseservices/exceptions/UnhandledExceptionHandler/PInvoke/PInvokeUnhandled.cs	Rename class, DllImport, and static constructor
src/tests/baseservices/exceptions/UnhandledExceptionHandler/PInvoke/CMakeLists.txt	New CMakeLists for PInvokeUnhandledNative
src/tests/baseservices/exceptions/UnhandledExceptionHandler/ForeignThreadRevPInvokeUnhandled	Removed obsolete CMakeLists
src/tests/baseservices/exceptions/UnhandledExceptionHandler/Foreign/ForeignUnhandled.csproj	Update source file reference in project
src/tests/baseservices/exceptions/UnhandledExceptionHandler/Foreign/ForeignUnhandled.cs	Rename class, DllImport, and static constructor
src/tests/baseservices/exceptions/UnhandledExceptionHandler/Foreign/CMakeLists.txt	New CMakeLists for ForeignUnhandledNative

[mdh1418]

Not sure how this dllimport resolved before when the file and cmake used ForeignThreadRevPInvokeUnhandledNative

[mdh1418]

I've also explored putting the two projects directly under UnhandledExceptionHandler, but I'm not familiar enough with the build/CMake to avoid having each other's native files in the test artifacts directories.