Add coverage for welcome message output

[fabricekabongo]

Summary

• add adapters to allow the welcome message to be exercised with test doubles
• add a unit test that validates the welcome message includes configuration and cluster details

Testing

• go test ./...

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Codex Task

[deepsource-io]

Here's the code health analysis summary for commits a8cfbf4..32b2817. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Docker	✅ Success		View Check ↗
Secrets	✅ Success		View Check ↗
Test coverage	❌ Failure	❗ 5 occurences introduced	View Check ↗
Go	✅ Success		View Check ↗

Code Coverage Report

Metric	Aggregate	Go
Composite Coverage	64.4% (up 3.7% from main)	64.4% (up 3.7% from main)
Line Coverage	64.4% (up 3.7% from main)	64.4% (up 3.7% from main)
New Composite Coverage	20%	20%
New Line Coverage	20%	20%

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