Port existing _notification code to use switch statements (part 1/3)

[jmb462]

Following #58151, the rest of the codebase should be given the same treatment to review all _notification methods and ensure that they use switch statements instead of a list of if (p_what == NOTIFICATION_*).

First chunk of #58155

editor/action_map_editor.cpp
editor/animation_bezier_editor.cpp
editor/animation_track_editor.cpp
editor/audio_stream_preview.cpp
editor/code_editor.cpp
editor/connections_dialog.cpp
editor/create_dialog.cpp
editor/debugger/debug_adapter/debug_adapter_server.cpp
editor/debugger/editor_debugger_inspector.cpp
editor/debugger/editor_debugger_node.cpp
editor/debugger/editor_debugger_tree.cpp
editor/debugger/editor_network_profiler.cpp
editor/debugger/editor_profiler.cpp
editor/debugger/editor_visual_profiler.cpp
editor/debugger/script_editor_debugger.cpp
editor/editor_about.cpp
editor/editor_audio_buses.cpp
editor/editor_autoload_settings.cpp
editor/editor_dir_dialog.cpp
editor/editor_export.cpp
editor/editor_feature_profile.cpp
editor/editor_file_dialog.cpp
editor/editor_file_system.cpp
editor/editor_help.cpp
editor/editor_help_search.cpp
editor/editor_inspector.cpp
editor/editor_log.cpp
editor/editor_node.cpp
editor/editor_path.cpp
editor/editor_plugin.cpp
editor/editor_plugin_settings.cpp
editor/editor_properties_array_dict.cpp
editor/editor_properties.cpp
editor/editor_resource_picker.cpp
editor/editor_run_native.cpp
editor/editor_settings_dialog.cpp
editor/editor_spin_slider.cpp
editor/editor_toaster.cpp
editor/editor_zoom_widget.cpp
editor/export_template_manager.cpp
editor/filesystem_dock.cpp
editor/find_in_files.cpp```

[akien-mga]

Looks great! A couple issues noted in comments but the rest seems good.

[akien-mga]

Thanks!