Reenable dynamic menus on macOS in Insiders

[sbatten]

As part of this, investigate the caching of menu items to quickly populate the menu on launch.

• Cache items and restore a menu with everything enabled by default
• When no window is open, use cached menu show disabled menu items
• When item is triggered without render process, it will be scheduled.

/cc @bpasero

[sbatten]

related: we can keep old application menus around to avoid GC as a workaround for #55347 to do this on linux as well

[bpasero]

@sbatten I think we need the same trick on Windows as well (keep old menus around for a bit).

[bpasero]

@sbatten just so that we do not forget, this needs a test plan item or verification needed at least. I will add the label now so we do not forget.