Console VM stuck when paste long line

##### ISSUE TYPE

* Bug Report

##### COMPONENT NAME

~~~
Console VM
Instance
~~~

##### CLOUDSTACK VERSION

~~~
4.19.1.1
~~~

##### CONFIGURATION

##### OS / ENVIRONMENT

VMware esxi: 8.0.2
vSphere: 8.0.2

##### SUMMARY

When i paste long line (about 15-20 characters) to Console VM with Clipboard in NoVNC, Console VM stuck and i can't do anything until reboot VM

With KVM everything is normal

##### STEPS TO REPRODUCE

~~~
Paste long line to clipboard then press send
~~~

##### EXPECTED RESULTS

~~~
Console VM normal
~~~

##### ACTUAL RESULTS

~~~
Console VM stuck with consoleproxy and Remote Console vSphere.
~~~

先重現回報的步驟：透過 NoVNC Clipboard 將一行 15–20 個字元的內容貼到 VMware vSphere Console VM 中，然後比較其與 KVM 的行為。追蹤 VMware 案例中涉及的 Console VM 和 consoleproxy 路徑。當長篇剪貼簿貼上不再使主控台停滯或需要重新啟動 VM 時，即表示完成。

由索引模型根據 Issue 內容生成。