Menu entry for command 'application:close' is duplicated.

[jtpio]

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The following warnings are logged in the dev tools console:

settingregistry.js:803 Menu entry for command 'filemenu:close-and-cleanup' is duplicated.
settingregistry.js:803 Menu entry for command 'application:close' is duplicated.

They likely come from the definition of the menu entries order in:

https://github.com/jupyter/notebook/blob/91dc1190b8106c9a4402833d8130d5b7f6a3064a/packages/application-extension/schema/menus.json#L21-L28

This was added in https://github.com/jupyter/notebook/pull/6937 to mimic the look of the classic notebook.