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.
~~~

首先复现报告的步骤：通过 NoVNC Clipboard 将一行 15–20 个字符的内容粘贴到 VMware vSphere Console VM 中，然后将其行为与 KVM 进行比较。跟踪 VMware 场景中涉及的 Console VM 和 consoleproxy 路径。当长文本剪贴板粘贴不再导致控制台卡住或要求重启 VM 时，即视为完成。

由索引模型根据 Issue 内容生成。