Report parsing security reports failures

Related to Add vulnerabilities counter to left menu (#363588), we need to be aware that some reports fail to parse.
Failing jobs are reported to users, but not this operation because it doesn't make the job fail.
We have jobs that have been failing to report for months without being noticed.

Proposal

There are several ways to solve this:

1. The most obvious and my favorite option: Make the job fail if the report parsing fail. This can be tricky, because the job status has to be changed after having succeeded (the state is already set).
2. Report the failure in the UI, in the left menu (with something like a ⚠ sign) next to Secure.
3. Notify the user specifically for this failure via email.