feat: add detailed error handling for job deserialization in jobs.rs

[techvoyagerX]

This PR introduces enhanced error handling in the deserialize_job function within jobs.rs. The update provides field-specific error messages, improving traceability and making it easier to identify the source of deserialization failures. Each field (id, name, scheduled_at, metadata, executed_at, and error_message) now has its own error context, which helps with debugging and improves overall reliability.

[ehuss]

Thanks for the PR! These don't look like functions that should fail, and we would prefer to not add this.