Adjust JetBrains Backend Plugin to work with the new Port Forwarding API

[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 doesn't throw errors, but before setting it as Ready for Review, here's what we need to accomplish:

• 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)

• Epic: JetBrains Ports information shown on terminals #10581

How to test

1. Open the preview environment of this PR: https://felladrin-a8c1911845.preview.gitpod-dev.com/
2. In the account preferences, select the Latest JetBrains IntelliJ IDEA as the editor
3. (...)

Release Notes

NONE

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-felladrin-port-forwarding.1 because the annotations in the pull request description changed
(with .werft/ from main)

[felladrin]

Closed in favor of #13747, due to an issue with old Preview Environments [1].