Inspector: NavigationSidebarPanel should pretend that filters were updated when
it is shown, so that any applicable placeholders can be displayed.
Inspector: remove unused `console.probe` from Console.idl.
Inspector: merge ScriptProbeServer into ScriptDebugServer.

These were performing nearly the same actions, and it was awkward to have two
classes that need to respond to the same debugger events.

This commit also removes the ENABLE(WEB_REPLAY) guard from probes implementation,
and adds the ENABLE(JAVASCRIPT_DEBUGGER) guard to uses of probe functionality.