Broaden VirtualBox-only `vagrant-disksize` plugin notice condition

[jasalt]

The plugin vagrant-disksize is incompatible with everything other than VirtualBox, but it's currently only noticed about on ARM64.

VVV/Vagrantfile

Lines 563 to 565 in 8c7a42c

	if Etc.uname[:version].include? 'ARM64'
	puts "WARNING: Vagrant disksize requires VirtualBox, if you are not using VirtualBox please remove this plugin immediatley"
	end

Should show notice instead always unless Virtualbox is in use.

Came up related to #2780 (comment)

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[tomjn]

So if we remove the wrapping condition then it will show for everybody even virtualbox users, so we need something a bit smarter, e.g. an "Everything except virtualbox" provider config that's the inverse of what's immediatley before it.

Given there is no usable virtualbox for arm64, the condition is sound for a sub-set of users, aka those on apple silicon or raspberry pi's etc

We also can't use the presence of virtualbox to determine this either. E.g. what if I have virtualbox installed but parallels or VMWare is my provider? Then I wouldn't see the warning