Validate spread expressions before packing in `*craft test`

Metadata

Project: craft-application
Number: #787
Type: issue
State: open
Author: lengau
Labels: Type: Enhancement
Created: 2025-06-13 14:04:21+00:00
Updated: 2025-06-13 14:05:50+00:00
Closed: —

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Issue body

### What needs to get done Before running the packing step, any spread expressions passed to the command. ### Why it needs to get done Saves user time

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