🎨 Palette: [UX improvement]

[ruhdevops]

This PR implements several micro-UX improvements to the introductory Prefect tutorial scripts to enhance the first-time user experience.

💡 What:

• Guaranteed unique customer IDs in demo output by switching to random.sample.
• Improved task pacing by adding a brief 100ms pause during the data fetching phase, ensuring the "Fetching" status spinner is visible and creates a "tactile" feel.
• Cleaned up the terminal output by removing redundant labels after titled rich.Rule components.

🎯 Why:

• Duplicate IDs in a "customer list" can be confusing and appear like a bug to new users.
• Without a slight delay, the "Fetching" state in these small demos was too fast to see, making the workflow feel instantaneous rather than illustrative.
• Reducing redundant bold styling and labels improves the visual hierarchy and reduces noise in the CLI experience.

♿ Accessibility:

• These changes focus on visual feedback and clarity, ensuring that state transitions are perceptible to users by giving the UI enough time to register "work in progress" states.

📸 Verification:

• Both 01_getting_started.py and 02_logging.py were run to confirm the output meets UX standards.
• Linting (black, ruff) and type-checking (mypy) passed successfully.

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PR created automatically by Jules for task 5098955952166587499 started by @ruh-al-tarikh

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