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[FIX] Replace portscanner in server with a native port scan (#808)

JIRA: CPOUI5FOUNDATION-1359

Replace the unmaintained portscanner dependency with a small
connect-probe helper built on node:net, removing the dependency
entirely.

isPortInUse() mirrors portscanner's semantics exactly: a successful TCP
connection means the port is in use, a refused connection or timeout
means it is free, and any other socket error rejects as a scan failure.
findAPortNotInUse() scans the inclusive range for the first free port.

Because the probe semantics are unchanged, the existing behavior is
fully preserved (including detection of occupiers bound to the dualstack
:: address) and no test occupiers needed adapting. Only the former
portscanner-stub test was rewritten to inject a generic socket error via
esmock.

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