DAL/GS: improve handle_prune implem, only take 'threshold' PXs

Mohamed IGUERNLALArequested to merge
iguerNL@gs@bound-number-of-chosen-px into master

Context

Manually testing the MR

Fixes #5781 (closed)

In the implementation of handle_prune in the automaton, we didn't check that the number of advertised PXs doesn't exceed the defined limit. This MR implements that.

Checklist

  • Document the interface of any function added or modified (see the coding guidelines)
  • Document any change to the user interface, including configuration parameters (see node configuration)
  • Provide automatic testing (see the testing guide).
  • For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
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Edited by Mohamed IGUERNLALA

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