Project Import/Export - Display UI warning when export is interrupted because of missing disk space

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Problem

Large project exports on SM instances can be problematic as the instance is at risk of running out of disk space as seen in https://gitlab.com/gitlab-com/request-for-help/-/issues/2126. Identifying the root cause is cumbersome as there's not clear error message that indicates the problem of missing disk space.

Proposal

We should improve the user experience by adding a warning/error message to the UI when the instance is running out of disk space during a project export. There are two possible scenarios that we need to consider:

• Disk gets full when we generate the file: In this case, the OS would raise an error.
• Disk gets full when we we compress the file: In this case the tar command generates a different error message.

We should address both cases and need to convert the generic error message to a more meaningful error message.