Summary

Closes #5095

Exposes project deletion through the CLI by adding a new feast projects delete <name> subcommand to the existing projects group.

What's changed

Added project_delete command to sdk/python/feast/cli/projects.py:

Usage: feast projects delete [OPTIONS] NAME

  Delete a project and all its resources from the registry.

  This removes the project entry from the registry. Individual objects
  (feature views, entities, data sources) that belong to the project
  are also purged when commit=True (the default).

Options:
  -y, --yes  Skip confirmation prompt and delete immediately.
  --help     Show this message and exit.

Design notes

• Uses store._registry.delete_project(name, commit=True) directly since FeatureStore does not yet expose a delete_project public method (the abstract method exists in BaseRegistry and is implemented in all concrete registries)
• Adds an interactive confirmation prompt with click.confirm — can be skipped with --yes / -y for scripting
• Raises SystemExit(1) on FeastObjectNotFoundException to match the pattern used by describe

Example

# Interactive (prompts for confirmation)
feast projects delete my-project

# Non-interactive
feast projects delete my-project --yes

Checklist

• Added delete command to projects_cmd group
• Confirmation prompt with --yes bypass flag
• Error handling for non-existent projects
• Follows existing CLI patterns in projects.py