Better error when no input is provided to `test` on a resource

[SteveL-MSFT]

Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest version
• Search the existing issues.

Summary

When invoking test directly on a resource, the desired state is required to compare againt. When not provided, dsc tries to read the input from STDIN and complains about the input being end-of-file.

Steps to reproduce

dsc resource test -r microsoft/osinfo

Expected behavior

An error messages that `test` requires input either via STDIN, `-i` or `-p`

Actual behavior

2024-07-08T11:46:41.398985Z ERROR Error: JSON: EOF while parsing a value at line 1 column 0

Error details

The current error is from reading STDIN and it's not provided, so the error isn't useful to the user to figure out what went wrong

Environment data

Name                           Value
----                           -----
PSVersion                      7.5.0-preview.3
PSEdition                      Core
GitCommitId                    7.5.0-preview.3
OS                             Darwin 23.5.0 Darwin Kernel Version 23.5.0: Wed May  1 20:16:51 PDT 2024; root:xnu-10063.121.3~5/RELEASE_ARM64_T8103
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Version

dsc 3.0.0-preview.8

Visuals

No response