fix(repository:) Add input validation for GetOperation

[Gijsreyn]

PR Summary

This pull request adds a simple input validation when it's empty for the GetOperation on the Repository resource.

PR Context

When --input is omitted, DSC closes the child process stdin without writing anything. The
resource manifest uses "input": "stdin" and invokes the script as $Input | ./psresourceget.ps1 ..., so $Input is an empty enumerator and the $stdinput pipeline parameter is never bound (keeping it $null).

Fixes #2001

PR Checklist

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• Breaking changes
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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds explicit handling for resource get when no --input/stdin is provided, preventing PowerShell parameter-binding errors and returning a clean non-zero exit code.

Changes:

• Add an early validation in GetOperation to fail fast when no input is provided.
• Add a CI test ensuring resource get without --input exits non-zero and avoids an unhandled exception.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
test/DscResource/PSResourceGetDSCResource.Tests.ps1	Adds a regression test for resource get without input to ensure clean failure behavior.
src/dsc/psresourceget.ps1	Adds a guard clause to reject missing stdin/--input before attempting JSON parsing.

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