apport-autoreport.service fails if autoreporting is disabled

[Benjamin Drung]

[ Impact ]

apport-autoreport.service fails if auto-reporting is disabled:

```
$ systemctl status apport-autoreport.service
× apport-autoreport.service - Process error reports when automatic reporting is enabled
     Loaded: loaded (/usr/lib/systemd/system/apport-autoreport.service; static)
     Active: failed (Result: exit-code) since Thu 2024-06-13 21:55:08 CEST; 1h 9min ago
TriggeredBy: ● apport-autoreport.timer
             ● apport-autoreport.path
    Process: 1059564 ExecStart=/usr/share/apport/whoopsie-upload-all --timeout 20 (code=exited, status=1/FAILURE)
   Main PID: 1059564 (code=exited, status=1/FAILURE)
        CPU: 86ms

Jun 13 21:55:08 host systemd[1]: Starting apport-autoreport.service - Process error reports when automatic reporting is enabled...
Jun 13 21:55:08 host whoopsie-upload-all[1059564]: ERROR: whoopsie.path is not enabled
Jun 13 21:55:08 host systemd[1]: apport-autoreport.service: Main process exited, code=exited, status=1/FAILURE
Jun 13 21:55:08 host systemd[1]: apport-autoreport.service: Failed with result 'exit-code'.
Jun 13 21:55:08 host systemd[1]: Failed to start apport-autoreport.service - Process error reports when automatic reporting is enabled.
```

This service failure might mislead user thinking that there is a problem.

[ Test Plan ]

1. Disable auto-reporting in the system setting:
  * open gnome-control-center or unity-control-center
  * Switch to "Security & Privacy" panel
  * Select "Diagnosticts" tab
  * unselect "Send error reports to Canonical"
2. Produce a crash, e.g. by running divide-by-zero from chaos-marmosets
3. Check that apport-autoreport.service is failing as above
4. Upgrade Apport to the fixed version
5. Restart apport-autoreport.service
6. apport-autoreport.service should exit successfully

[ Where problems could occur ]

This code change touches the auto-reporting part. Failures there could lead to less bugs being forwarded to the error tracker. This might be noticeable when looking at the number of submissions.

[Benjamin Drung (bdrung)]

Proposed fix: https://github.com/canonical/apport/pull/355

[Benjamin Drung (bdrung)]

https://github.com/canonical/apport/pull/355 got merged.

[Benjamin Drung (bdrung)]

The fix for this bug is staged for the next oracular upload.

[Steve Langasek (vorlon)]

> 1. Disable auto-reporting in the system setting

This doesn't look like a test case that can be followed by someone unfamiliar with the software.

[Benjamin Drung (bdrung)]

Extended point one with the individual steps.