fix(devcontainer): make Config UI and Grafana accessible from host when using devcontainers #8645
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Summary
Make config-ui dev server accessible outside the container when started by listening on 0.0.0.0 with the --host flag.
Also ensure it uses port 4000 or fails to start with --strictPort to prevent silent port change that will mismatch with the exported dev container port.
In addition, it makes Grafana accessible from dev container' config-ui by making the Grafana origin and origin change configurable and injected via the dev container environment variables.
web socket proxying (ws) is enabled regardless of dev container or not as it allows for features like grafana query auto-complete to work via the dev server proxy.
Does this close any open issues?
Closes #8638
Other Information
Re-opened as a new PR to better comply with the contribution guidelines (branch name + commit message)
(Initial PR)