This PR fixes a mistake from the previous PR
https://github.com/coder/coder/pull/18342. Merged configuration results
in the customization being an array not an object.
This PR also moves `displayApps` from being an array to being an object,
like the terraform provider has.
This change implements an interface for running `@devcontainers/cli up`
and an API endpoint on the agent for triggering recreate for a running
devcontainer.
A couple of limitations:
1. Synchronous HTTP request, meaning the browser might choose to time it
out before it's done => no result/error (and devcontainer cli command
probably gets killed via ctx cancel).
2. Logs are only written to agent logs via slog, not as a "script" in
the UI.
Both 1 and 2 will be improved in future refactors.
Fixescoder/internal#481Fixescoder/internal#482