jobs: `ProgressStorage` based jobs incorrectly drop to 0 `fraction_completed` on resume

Currently, when we resume a job, we call the `JobUpdater` [`started` function](https://github.com/cockroachdb/cockroach/blob/4e667e5c40918fe98297a437eca2d60bc43d4091/pkg/jobs/jobs.go#L243) which internally does a read-modify-write on the job's progress in order to set the trace id. For jobs using the newer `ProgressStorage` api to update progress, this means the job's `fraction_completed` will drop to 0 until the next progress update, as the job's legacy progress field is otherwise unused and contains zero-values.

Jira issue: CRDB-60669