Github action to check metadata lines in scripts.

[quantumryuu]

🛠️ Note:
We are meticulous about merging code into the main branch, so please understand that pull requests not meeting the project's standards may be rejected. It's never personal!
🎮 Note for game-related scripts: These have a lower likelihood of being merged.

---

✍️ Description

Github action to check the following:

• # Copyright (c) 2021-2024 community-scripts ORG
  Check if it exists in line 3
• # Author: [Name] (also checks if there is text after the space"
  Check if it exists in line 4 & that it has text after the space
• # License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
  Check if it exists in line 5
• # Source: [Source] (also checks if there is text after the space"
  Check if it exists in line 6 & that it has text after the space

---

Please remove unneeded lines!

• Related PR: Add initial PR for Contributing & Coding Standard #920 (if applicable)
• Related Discussion: Add initial PR for Contributing & Coding Standard #920 (comment) and Add initial PR for Contributing & Coding Standard #920 (comment)

---

🛠️ Type of Change

Please check the relevant options:

• Bug fix (non-breaking change that resolves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change unexpectedly)
• New script (a fully functional and thoroughly tested script or set of scripts)

---

✅ Prerequisites

The following steps must be completed for the pull request to be considered:

• Self-review performed (I have reviewed my code to ensure it follows established patterns and conventions.)
• Testing performed (I have thoroughly tested my changes and verified expected functionality.)
• Documentation updated (I have updated any relevant documentation)

---

📋 Additional Information (optional)

Provide any extra context or screenshots about the feature or fix here.