Add --no-example flag to init-windows CLI command

[Copilot]

This PR introduces a new --no-example flag for the yarn react-native init-windows CLI command that prevents the creation of example app directories during project initialization.

Problem

When using the cpp-lib template with init-windows, an example directory is automatically created to demonstrate usage of the library. However, there are cases where developers don't want this example directory to be created, such as when:

• Creating libraries for internal use where examples aren't needed
• Following specific project structures that don't include examples
• Minimizing the initial project scaffolding

Solution

Added a new --no-example boolean flag that:

1. Skips example directory creation when specified with the cpp-lib template
2. Maintains backward compatibility - default behavior unchanged when flag is not used
3. Only affects relevant templates - other templates like cpp-app are unaffected

Usage

# Create a library without example directory
npx @react-native-community/cli init-windows --template cpp-lib --no-example

# Default behavior (creates example directory)
npx @react-native-community/cli init-windows --template cpp-lib

Implementation Details

The implementation uses minimal, surgical changes:

• Added example?: boolean to the InitOptions interface
• Added the --no-example command line option definition
• Modified the cpp-lib template logic to check options.example !== false before processing example files
• Updated test validation and documentation

Testing

Comprehensive testing confirms:

• ✅ Default behavior: Example directory created when flag not specified
• ✅ With --no-example: Example directory skipped
• ✅ Other templates unaffected by the new flag
• ✅ All existing functionality preserved

Fixes #15091.

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Microsoft Reviewers: Open in CodeFlow