Make node aware of the latest_version route.

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Re-roll patch need to 11.x.

Rerolled for 11.x.

This will need test coverage. Why is the one test being removed?

The test that was removed was specifically testing the CM preprocessor which was removed so the test was no longer needed. Instead I've repurposed it to test the node_is_page function.

I was in 2 minds about doing this or 📌 Deprecate node_is_page and move into a service Active first but this might be easier to get in first.

Alternatively if we make it a service I guess CM could decorate it to add the condition to its own route 🤔

Can we update the issue summary to reflect the new scope and findings please.

Hiding patches

@smustgrave what exactly is missing from the IS? It explains exactly what we're doing?