feat: update ReplicateStatusCause serialization and worker_api to support new WorkflowError format

[nabil-Tounarti]

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[Copilot]

Pull Request Overview

This PR updates the ReplicateStatusCause error handling system to include dataset indices and modifies the worker API to support a new WorkflowError format that accepts multiple causes.

• Adds index parameters to dataset-related error variants to provide better error context
• Replaces custom Serialize derivation with manual implementation for structured error serialization
• Updates worker API to send arrays of errors instead of single error objects

Reviewed Changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pre-compute/src/compute/errors.rs	Adds index parameters to error variants and implements custom serialization with cause/message structure
pre-compute/src/compute/dataset.rs	Updates dataset methods to accept index parameters and pass them to error constructors
pre-compute/src/compute/pre_compute_args.rs	Updates error construction calls to include dataset indices
pre-compute/src/compute/pre_compute_app.rs	Adds enumeration to dataset iteration to provide indices for error reporting
pre-compute/src/compute/utils/env_utils.rs	Updates test to use new error variant with index parameter
pre-compute/src/compute/app_runner.rs	Modifies API calls to send arrays of errors instead of single error objects
pre-compute/src/api/worker_api.rs	Removes ExitMessage struct and updates API to handle arrays of ReplicateStatusCause

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