Important

Add API endpoint to count workflow evaluation projects and integrate it into the UI and database queries.

• API:
  • Added /internal/workflow-evaluations/projects/count endpoint in internal.rs to return workflow evaluation project count.
• Database:
  • Implemented count_workflow_evaluation_projects() in workflow_evaluation_queries.rs to query distinct project names.
  • Updated WorkflowEvaluationQueries trait in workflow_evaluation_queries.rs to include count_workflow_evaluation_projects().
• Handlers:
  • Added get_workflow_evaluation_project_count_handler() in get_project_count.rs to handle new endpoint.
• UI:
  • Updated index.tsx and route.tsx to use countWorkflowEvaluationProjects() from tensorzero.ts.
• Tests:
  • Added E2E tests in workflow_evaluation_queries.rs and workflow_evaluations.rs for project count functionality.
  • Updated unit tests in workflow_evaluations.test.ts to cover new API behavior.

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