This way the net names can be inspected in eeschema and cross-probing works.
Testcases updated for the name changes
CHANGED: all unconnected pins are now included in the netlist with no_connect_ prefixes
Depending on what order the subgraphs are processed in, it's
possible to hit a case where the parent sheet renames a bus
member before the bus neighbor renaming logic runs. In this
case, we don't want to apply the bus neighbor logic as it will
break connectivity to the parent sheet if that bus was not
also renamed (for example, if the hier ports only make net
connections and not bus connections)
Fixes https://gitlab.com/kicad/code/kicad/-/issues/6887
Jon Evans
Jeff Young