Add Integration Test and Demo for Static Manifest Feature

[MarcosDY]

The Static Manifest feature was recently introduced to the spire-controller-manager. To ensure its correct functionality and provide an example of its usage, we should:

• Add an integration test that verifies the behavior and correctness of the Static Manifest implementation.
• A demo configuration or example showcasing how to use the Static Manifest in a typical setup.

This will improve confidence in the feature and help users understand how to adopt it effectively.