chore: remove Visual Studio-related files for cross-platform cleanup

[Subham-KRLX]

This PR removes the build.cmd batch file from the Code Samples/Fib/ folder.

Since this file is specific to Windows and Visual Studio environments, removing it helps streamline the repository for cross-platform development and makes it cleaner for non-Windows contributors.

This is part of a minor cleanup effort to reduce legacy or unused platform-specific files.

[sean-mcmanus]

I don't understand why this file is being removed. It's still referenced in Code Samples/Fib/.vscode/tasks.json for the Windows section of tasks.json.

[Subham-KRLX]

Thanks for the review, @sean-mcmanus! I've now removed the reference to build.cmd from tasks.json as you pointed out. Let me know if there's anything else you'd like me to update.

[Colengms]

Hi @Subham-KRLX . Wouldn't this prevent this code sample from working correctly on Windows (i.e. with MinGW G++) ? I think we would want to retain the window specific arguments section.

I believe the build.cmd file is working around a known issue with MinGW that requires its bin directory to be in path when run, in order to properly resolve dependent DLLs. It may be possible to move that work-around into the TypeScript code in order to get rid of build.cmd. But I think we would still want to use of this code sample on Windows.