iotedge check-list doesn't run

## Expected Behavior
`sudo iotedge check-list` should display a list of the supported checks.
`sudo iotedge check --help` should display additional help for the check command.

## Current Behavior
Both behave identically to `sudo iotedge check`.

## Steps to Reproduce
Provide a detailed set of steps to reproduce the bug.
1. `sudo iotedge check-list`
2. `sudo iotedge check --help`

Also of note is that the `iotedge check` command appears to ignore other arguments, like `--help` and `--dont-run`.

## Context (Environment)

### Output of `iotedge check`

Not relevant.

### Device Information
* Host OS [e.g. Ubuntu 22.04, Windows Server IoT 2019]: Ubuntu 24.04.2
* Architecture [e.g. amd64, arm32, arm64]: amd64
* Container OS [e.g. Linux containers, Windows containers]: Linux containers

### Runtime Versions
* aziot-edged [run `iotedge version`]: iotedge 1.5.21
* Edge Agent [image tag (e.g. 1.0.0)]: 1.5.16
* Edge Hub [image tag (e.g. 1.0.0)]: 1.5.16
* Docker/Moby [run `docker version`]: 28.3.3-1

## Logs
Not relevant.

## Additional Information

The `aziotctl` command behaves as expected; `check-list` works and `check --help` shows help, and `check --dont-run` skips the requested checks.

Also, part of the reason why I want to skip certain checks is that the timeouts are insanely long; if you're in a heavily-firewalled environment that blocks `aka.ms` or AMQP/MQTT ports then you have to sit through multiple ~70s timeouts.

Start by locating the iotedge check command handling and compare its argument behavior with the aziotctl command, especially for check-list, --help, and --dont-run. Done means these arguments produce their expected output or skip behavior instead of behaving like plain check.

Written by the indexing model from the issue text.