Improve output for missing inputs

### TL;DR

When the `describe` command is implemented we should inform the user to learn about the required inputs.

> NOTE: This is only applicable when the quiet flag is passed and prompting is disabled.

Example output:

```shell
abc templates render -quiet
missing required input(s):
- input_1
- input_2

Run the following command to show details for this template:

abc templates describe
```

### Detailed design

_No response_

### Alternatives considered

_No response_

### Additional information

_No response_