chore: Properly untrack WebSocket config file for docker

[Vitor-Avila]

SUMMARY

This is a follow up to: #35896. It properly untracks the config file for the websocket service for Docker, so that changes are git-ignored.

Added notes to UPDATING to avoid any impact.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

N/A

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

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[codeant-ai-for-open-source]

Sequence Diagram

This PR removes the tracked default websocket config, adds guidance to UPDATING, and expects users to keep a local docker/superset-websocket/config.json that is git-ignored and mounted into the superset-websocket container. The diagram shows the main success path for how a developer provides the config to the running Docker service.

sequenceDiagram
    participant Developer
    participant GitRepo
    participant DockerCompose
    participant superset-websocket

    Developer->>GitRepo: Keep local docker/superset-websocket/config.json (git-ignored)
    Developer->>DockerCompose: Start services (docker-compose up)
    DockerCompose->>superset-websocket: Mount local config.json into container
    superset-websocket-->>DockerCompose: Read configuration and start WebSocket server
    superset-websocket-->>Developer: WebSocket service running with local config

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[Antonio-RiveroMartnez]

lgtm, seems like we should have never tracked this file in the first place.