Terminal suggest: Make sure cd - completions play nice in pwsh

[Tyriar]

I see this coming in #234363:

			{
				name: '-',
				description: 'Switch to the last used folder',
				hidden: true,
			}

In pwsh it's actually - as in -/+ and they navigate a history stack, not just toggle between the last directory ($OLDPWD in bash). We could improve the wording for pwsh and add cd + as well (especially if hidden does what I think it does and doesn't show it unless typed), similar to the pwsh support from the script:

When I looked into it this history stack is internal so we can't resolve the folder and stick it on the right for pwsh unfortunately, we might be able to do it on shells that use $OLDPWD.