Fix report approval by admins and when automatic

[gjvoosten]

Allow admins to approve all reports. The front-end already allowed it, but the back-end refused it. Automatic report approval (after the timeout set in the dictionary) did not work for reports that had only been submitted; this is now fixed. Show "system" instead of "Unspecified" when a report was automatically published.

Closes AB#1186

User changes

• None.

Superuser changes

• None.

Admin changes

• Admins can now approve all reports (e.g. when the person(s) who need to approve are no longer available).
• Submitted reports now also get automatically approved after the timeout if they haven't been manually approved in time.

System admin changes

• [ ] anet.yml or anet-dictionary.yml needs change
• [ ] db needs migration
• [ ] documentation has changed
• [ ] graphql schema has changed

Checklist

• [x] Described the user behavior in PR body
• [x] Referenced/updated all related issues
• [x] commits follow a repo#issue: Title title format and these 7 rules
• [x] commits have a clean history, otherwise PR may be squash-merged
• [ ] Added and/or updated unit tests
• [ ] Added and/or updated e2e tests
• [ ] Added and/or updated data migrations
• [ ] Updated documentation
• [x] Resolved all build errors and warnings
• [ ] Opened debt issues for anything not resolved here

[gjvoosten]

The front-ends suggest, to an ANET admin, that a draft report can be approved. When this approval button is pressed, the servver returns with an error:

Bad Request: Exception while fetching data (/approveReport) : This report is not pending approval

The "Approve" button should not be enabled on a draft report.

Caused by a change for AB#991 quite some time ago; fixed in an additional commit on this PR.