Make Qt WebChannel examples self-contained


The examples compiled shared transport sources from
examples/webchannel/shared, violating QUIP-13. This breaks the
"copy example out of tree" feature of Qt Creator and VS Code, which
requires examples to not reference files outside their own directory.

Each example now carries its own copy of the websocket transport and
client wrapper sources; the shared folder is removed.

Task-number: QTBUG-147516
Pick-to: 6.11 6.12
Change-Id: Ie2cffc88e1fe7e3864e0005b7669796890861a07
Reviewed-by: Kai Köhne <kai.koehne@qt.io>
commit9391f239004e8a5e5ab86069d0028240f465a6a2
parentedc575ff20725cb836e2aad9e91a88d7ae48cd06
authorJoerg Bornemann <joerg.bornemann@qt.io>
committerJoerg Bornemann <joerg.bornemann@qt.io>
commit timeFri, 19 Jun 2026 14:18:37 +0000