Stop running shrinking gcs & simplify GC logic.

Shrinking GCs dump the JITted code, which leads to redundant recompilations, lowers performance, and makes profiling JS more difficult.
They may still happen if the runtime is at risk of OOM.

source/network/NetServer.cpp

@@ -424,7 +424,7 @@ bool CNetServerWorker::RunStep()
 	// (Do as little work as possible while the mutex is held open,
 	// to avoid performance problems and deadlocks.)
 
-	m_ScriptInterface->GetContext().MaybeIncrementalGC(0.5f);
+	m_ScriptInterface->GetContext().MaybeIncrementalGC();
 
 	ScriptRequest rq(m_ScriptInterface);