Add optional status=COMPLETED parameter for filtering judgments.

[epugh]

Description

For JudgmentComboBox it filters to just COMPLETED judgments, but preserves the list all Judgments page.

Issues Resolved

Fixes opensearch-project/search-relevance#266

Check List

• [ x] New functionality includes testing.
  • [ x] All tests pass, including unit test, integration test
• New functionality has been documented.
• [ x] Commits are signed per the DCO using --signoff

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[Copilot]

Pull Request Overview

This PR adds optional status filtering for judgment list queries, allowing the JudgmentsComboBox component to fetch only COMPLETED judgments while preserving the existing behavior for the judgment listing page.

Key Changes:

• Added query parameter validation for optional status field in the Judgments GET endpoint
• Modified backend routing to forward the status query parameter to the backend API
• Updated JudgmentsComboBox to request only COMPLETED judgments

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
server/routes/search_relevance_route_service.ts	Added schema validation for optional status query parameter and logic to append it to backend URL
public/components/judgment/__tests__/use_judgment_list.test.ts	Added comment verifying that existing hook continues to request all judgments without status filter
public/components/experiment/configuration/form/judgments_combo_box.tsx	Modified to pass status: 'COMPLETED' query parameter when fetching judgments
public/components/experiment/configuration/form/__tests__/judgments_combo_box.test.tsx	Added new test file to verify that combo box requests only COMPLETED judgments

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