fix (samples): rename feature_samples schemas to avoid DABs "target" folder exclusion

[Ben-Dowling]

Fixes #45 - Raised bug to document the issue

Problem

samples/bronze_sample/src/dataflows/feature_samples/schemas organises schema files into source/ and target/ subfolders. Databricks Asset Bundles (DABs) ignores folders named target during deployment, resulting in missing schemas at runtime and causing sample pipelines to fail.

Solution

Flattened schemas/source/ and schemas/target/ into a single schemas/ directory, prefixing files with source_ or target_ to retain the distinction.

Testing

• Verified deployed workspace contains all schema files
• Sample pipeline runs successfully with flattened schema structure