Handle dynamic routes / catchall routes in on-demand-entries

[timneutkens]

Ensures the on-demand entries ping does not return invalid when dynamic routes are used. There was a small bug with how the entrypoint path was constructed where it was missing tthe brackets. Downside to this is that the tree needs to hold the type of parameter in order to reverse-resolve the entrypoint that, tried to mimize that by using a short identifier

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