remove centered layout from layout menu

[sbatten]

fixes #62984

See comment
#62984 (comment)

[isidorn]

Thanks for this PR.
I know that @bpasero specificly introduced this action in our layout menu.
It feels to me like it belongs in the layout menu, and not in the Appereance menu - and we should remove it from there. However if we put it in the layout menu than it is not consistent with the other non toggling layouts.
In the apperance menu there is already zen mode which is more general than just layout and is a super set of centered editor layout.

@bpasero @misolori let me know what you think

[bpasero]

I am fine removing it from the "Layout" menu because it is a broader thing compared to the other options (and a toggle actually). Strictly speaking, editor layouts are about how to arrange editor groups and the centered editor layout is not doing that, but just changing another layout option.

[isidorn]

It also has some automatic resize behavior so it is a bit differnt to other options.
So yeah let's go with the removal in the layout menu. Merging this PR in