✨ Accessing "Old" Consulting Pages

[isaaclombardssw]

cc's: @Calinator444 @adamcogan @wicksipedia

Is your feature request related to a problem? Please describe.
We're redesigning the consulting pages (see #3306), but editors or stakeholders might want to see the previous page for comparison.

Describe the solution you'd like
Current behaviour... going to a consulting route page with both a new and old entry in Tina will prioritise showing users the new page.
Proposed solution... Accessing a consulting page with the url query ?old=true guarantees providing the "old" consulting page for that specific route.

Describe alternatives you've considered
An extra path segment ex. consulting/old/{{name}} to guarantee showing the old pages.

Additional context
From the sprint review on 5/12/24.