Fix the auto-port-forwarding on JetBrains EAP IDEs

[felladrin]

Description

Now that we have EAP IDEs build 223.6x available in gitpod.io, we need to update the back-end plugin with the support for the new Port Forwarding API.

In the current state of this PR, the plugin compiles and makes the auto-forwarding work again for EAP IDEs.

In a follow-up PR we should:

• Ensure the usage of port name/description columns is working.
• Remove the unused function overrides from object: ForwardedPortListener.
• Confirm there's no other way to dispose the forwarded ports listeners (currently we use a map for it).
• Confirm if ports are removed from the UI when programatically removed.

Related Issue(s)

• Fixes Automatic Port Forwarding stopped working on JetBrains EAP IDEs #13761

How to test

1. Open the preview environment of this PR: https://jetbrains-d939b7c0c7.preview.gitpod-dev.com/workspaces
2. In the account preferences, select the Latest JetBrains IntelliJ IDEA as the editor
3. Start a workspace from https://github.com/gitpod-io/spring-petclinic and check if it there's no error triggered.
4. Open a new terminal and check if when running python3 -m http.server 2593 it automatically forwards the server port, so you're able to access http://127.0.0.1:2593
   
5. Don't worry about "Control Center >> Ports" view at this moment. We'll need to learn more about the new API before properly controlling it. It should be done in a follow-up PR.

Release Notes

Fixed auto-port-forwarding on JetBrains EAP IDEs

Werft options:

• /werft with-local-preview
  If enabled this will build install/preview
• /werft with-preview
• /werft with-large-vm
• /werft with-integration-tests=all
  Valid options are all, workspace, webapp, ide

[werft-gitpod-dev-com]

started the job as gitpod-build-jetbrains-port-forwarding.1 because the annotations in the pull request description changed
(with .werft/ from main)

[andreafalzetti]

Works as expected ✅

We also did review the code together 🚀