[.NET Migration Guide Revamp] [Phase 1] Move page 'C++/CLI'

[StephenBonikowsky]

For details on revamp see: #23561
New TOC: #23215

• C++/CLI (MOVE) Move this page and its content to the new TOC location...

• name: Migration guide
  items:

  • name: Overview
    href: ../core/porting/index.md
  • name: General Information
    items:
  • name: Pre-Migration
    items:
  • name: Migration
    items:
    • name: Application Porting Guides
      items:
      • name: C++/CLI
        href: ../core/porting/cpp-cli.md

[StephenBonikowsky]

Completed with #24630