Revert hiding some notebook toolbars

[roblourens]

We need to rerender the menu when thsi setting changes, because it determines which actionViewItem is used. cc @jrieken @rebornix

This reverts commit 517448a.

[jrieken]

Sorry for the breakage and thanks for the fix

We need to rerender the menu when thsi setting changes,

Is that something that you can express with a config-context key? Each config-value is exposed as context key named config.<settings_name>

[roblourens]

Hm, we already have two registrations in that menu, based on that config context key, so the label can change:

https://github.com/microsoft/vscode/blob/4c41daaa261c576e8c1e8b1ac1d47fe40820659c/src/vs/workbench/contrib/notebook/browser/controller/insertCellActions.ts#L224-L251

I guess I'm not sure why it wasn't being rerendered before

[roblourens]

This is a real pain to debug, but I guess this is just because the setting is not officially registered, it's an undocumented setting. @rebornix should we just decide right now whether to officially register this setting (can still be "experimental") or delete it?

[roblourens]

In notebook standup we decided that supporting normal hiding doesn't really work in notebooks for most toolbars. They don't feel like normal menus, if we want to customize these things it should work differently. I reverted it for every toolbar except the title toolbar where it works quite well. Reverting the IW toolbar also fixed the issue we saw with the run button always showing inside a ... fyi @rebornix, there must be something unusual on that one.