Vulnerability export: add tags column

[marevers]

Is your feature request related to a problem? Please describe.
When exporting CVE lists from projects, there is no column containing the tags associated with the artifact. This makes it hard to link the CVEs to the specific tags that contain the CVEs. This is problematic, as the digests are automatically generated they are not really humanly readable.

Describe the solution you'd like
The CSV file should contain a column containing the tags associated with the digest.

Describe the main design/architecture of your solution
The export data model would need to have the tags field added. As multiple tags (or no tags) can be associated with a digest, it would need to allow multiple values or no values. In the export, the tags can be comma separated within the field if there are multiple, like the CWE Ids column.