[wasm][coreclr] Add scripts to generate the helpers

[radekdoulik]

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[radekdoulik]

@AaronRobinsonMSFT please try the .cmd version of the script. I tested the bash version and let copilot create the .cmd version.

I also remembered that the testhost folder has all the assemblies, so the script doesn't need to build any runtime tests after all.

[Copilot]

Pull request overview

This PR adds shell scripts to generate CoreCLR call helpers for WebAssembly. The scripts automate the process of running the ManagedToNativeGenerator task to produce C++ helper files needed for CoreCLR on WASM.

Changes:

• Added shell scripts (generate-coreclr-helpers.sh and generate-coreclr-helpers.cmd) to automate CoreCLR helper generation for WASM
• Modified the assembly scanning glob pattern in WasmAppBuilder.csproj from recursive to non-recursive
• Updated documentation to reference the new generator scripts

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/tasks/WasmAppBuilder/generate-coreclr-helpers.sh	Bash script for Unix/macOS to generate CoreCLR WASM helpers with configurable paths and build configuration
src/tasks/WasmAppBuilder/generate-coreclr-helpers.cmd	Windows batch script equivalent with similar functionality and error handling
src/tasks/WasmAppBuilder/WasmAppBuilder.csproj	Changed assembly glob pattern from recursive (**/*.dll) to non-recursive (*.dll)
docs/workflow/wasm-documentation.md	Added documentation section explaining how to use the generator scripts

[AaronRobinsonMSFT]