[gh] Rework error Reporting in app-test workflow

[michelroegl-brunner]

✍️ Description

This PR reworks the error Reporting to make use of $STD but dont lose the wanted information. So pip, npm etc. warnings will no longer be commented.

🔗 Related PR / Discussion / Issue

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✅ Prerequisites

Before this PR can be reviewed, the following must be completed:

• Self-review performed – Code follows established patterns and conventions.
• Testing performed – Changes have been thoroughly tested and verified.

🛠️ Type of Change

Select all that apply:

• 🐞 Bug fix – Resolves an issue without breaking functionality.
• [] ✨ New feature – Adds new, non-breaking functionality.
• [] 💥 Breaking change – Alters existing functionality in a way that may require updates.
• [] 🆕 New script – A fully functional and tested script or script set.

📋 Additional Information (optional)