polish go1.23 range-over-func UX

[hyangah]

Tested with the current master:

UX improvement candidates:

• Collapse/hide the range body closure (or give an option like DAP implementation's HideSystemGoroutines or config) - Related golang/go#66468

• Hide range closure related variables from the local variable set (e.g. .closureptr, #state, ~r0)

[aarzilli]

See #3732 (wip)