Refactor: Extract metadata generation into separate script

- Created new bin/generate_connector_metadata_files.py for metadata models
- Reverted bin/generate_component_manifest_files.py to main (no changes)
- Updated build script to call both generators
- Keeps concerns separated for easier review and maintenance

Co-Authored-By: AJ Steers <aj@airbyte.io>

Author: devin-ai-integration[bot]

bin/generate-component-manifest-dagger.sh

@@ -8,3 +8,4 @@
 set -e
 
 python bin/generate_component_manifest_files.py
+python bin/generate_connector_metadata_files.py