Issue for tracking finalization (or deprecation) of the various notebook API proposals

Key

⬆️ — Waiting for extensions (upstream)

Tasks

• ⬆️ Removing the notebookDeprecated proposal  #146831
• Remove the notebookContentProvider API proposal #147248
• Migrate to new notebook workspace edit api #149181
• Finalize "simpleUI" debug option #147264
• Finalize the notebook workspace edit API #155245
• Remove the notebookEditorDecorationType api proposal #146838
• Finalize notebookEditor API proposal  #149271
• Removing the textDocumentNotebook API proposal #147414
• Removing the notebook concat text document API proposal  #146781