Support additional fields to start api

[Assem-Uber]

Summary
Add following fields to start API:

• Header
• Memo
• SearchAttributes
• Retry Policy
• WorkflowIdReusePolicy

Changes

• Add fields to schema
• Pass fields to the startEndpoint
• Make log function switch between info & error based on the error type

Test
Locally through Form

[Copilot]

Pull Request Overview

This PR extends the start workflow API to support additional workflow configuration fields including Header, Memo, SearchAttributes, Retry Policy, and WorkflowIdReusePolicy. It also improves error handling by differentiating between duplicate workflow errors and other errors in logging.

• Add support for 5 new workflow configuration fields in the API schema and request handling
• Implement conditional logging that uses info level for duplicate workflow errors instead of error
• Add comprehensive test coverage for all new fields with proper data transformation verification

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/utils/grpc/grpc-error.ts	Maps ALREADY_EXISTS gRPC status to HTTP 409 for duplicate workflow handling
src/route-handlers/start-workflow/start-workflow.ts	Processes new workflow fields and implements conditional error logging
src/route-handlers/start-workflow/start-workflow.constants.ts	Defines valid WorkflowIdReusePolicy enum values
src/route-handlers/start-workflow/schemas/start-workflow-request-body-schema.ts	Adds validation schemas for new workflow configuration fields
src/route-handlers/start-workflow/tests/start-workflow.node.ts	Adds comprehensive test coverage for all new fields with proper assertions

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