Update project export job status upon failure

What does this MR do and why?

When a project export is initiated, we create a ProjectExportJob database record that tracks the progress of the Sidekiq job. If an export fails, the record may cause the project export status to indicate "in progress" or "regeneration in progress" until the StuckExportJobsWorker comes along and updates this job status as failed.

We can expedite this process by handling failures and marking the job status appropriately.

Relates to #351155 (closed)

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

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