This changes makes it so that we output the empty string for Format
when there is no data. It turns out there are many places in the code
where we have such handling, but in a way that would break the JSON
formatter (since we'd output nothing on stdout or text rather than
`[]`/`null`).
## Overview
This change promotes the tasks CLI commands from `coder exp task` to
`coder task`, marking them as generally available (GA).
## Migration
Users will need to update their scripts from:
```shell
coder exp task create "my task"
```
To:
```shell
coder task create "my task"
```
---
🤖 This change was written by Claude Sonnet 4.5 Thinking using [mux](https://github.com/coder/mux) and reviewed by a human 🏄🏻♂️
Mathias Fredriksson