### What?
- Makes `jobs.workflows` optional
- Dynamically include the `workflowSlugs` select field in the jobs
collection as needed
### Why?
When configuring jobs, it should be possible to define `job` with just
some simple tasks and not be forced to define workflows.
### How?
Workflows type was made optional and optional chaining is added where
needed. The workflowSlugs field is added to the jobs collection if
workflows are defined.
Fixes #
When using postgres, the workflowSlugs being an empty enum cause an
error when drizzle fails to detect the enum already exists. This results
in the error `"enum_payload_jobs_workflow_slug" already exists`. Drizzle
tries to make the enum as: `enum_payload_jobs_workflow_slug as enum();`
and the check for existing enums only works when it has values.
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