[WIP] Fix issue labeling ports exposed by appPort

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Unable to label ports exposed by appPort</issue_title>
<issue_description>

• VSCode Version: 1.105.0
• Local OS Version: Windows 11 25H2
• Remote OS Version: Ubuntu 24.04.3 LTS
• Remote Extension/Connection Type: Dev Containers
• Logs: N/A

Steps to Reproduce:

1. Clone https://github.com/home-assistant/core

2. Include portAttributes to the devcontainer.json:

   {
     "appPort": ["8123:8123"], // existing
     "portsAttributes": {
       "8123": {
         "label": "Home Assistant",
         "onAutoForward": "silent"
       }
     }
   }

3. Reopen in the devcontainer

4. Check ports tab:

No Home Assistant label. I was expecting to see something like:

Note that appPort cannot be refactored into forwardPorts because of:

1. Proposal: support forwarding UDP ports devcontainers/spec#643
2. https://github.com/home-assistant/core/pull/154099/files#r2417724273

Does this issue occur when you try this locally?: N/A
Does this issue occur when you try this locally and all extensions are disabled?: Yes

This is related to #11254.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Unable to label ports exposed by appPort #11253

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.