Backport: Honour consoleproxy.session.timeout for noVNC console sessions

[dheeraj12347]

Description

This PR backports the console proxy/noVNC timeout fix to the 4.20 branch.

It ensures that consoleproxy.session.timeout is honoured for noVNC console
sessions, so idle sessions are cleaned up correctly and do not linger
indefinitely.

Key points:

• Wire consoleproxy.session.timeout through the console proxy server for
  noVNC-based console sessions.
• Apply the timeout in the WebSocket handler and GC thread so idle sessions
  are closed after the configured period.
• Keep the change minimal and compatible with 4.20: do not introduce the
  newer sessionRequiresNewViewer API on ConsoleProxyClientParam, only
  remove the references that exist in later branches.

Related work

• Backport of the console proxy timeout fix from the main branch.
• Intended to address the same behaviour as the upstream change that fixed
  idle noVNC sessions not respecting consoleproxy.session.timeout.

Testing

• Compiled the console proxy server module successfully:

  mvn -pl services/console-proxy/server -am -DskipTests compile

• Verified that the code builds cleanly with checkstyle on the 4.20 branch.
  Fix Global setting "consoleproxy.session.timeout " is not honoured #12810