Consider identifiers for OpenScanHub reporting

[lbarcziova]

For projects with multiple Copr build jobs configured (e.g. monorepositories), we submit multiple scans, but when reporting, use just one check name, which results in overwriting the statuses and informing the user just about one scan.

TODO:

• include the identifier (of the Copr build job) in the check name for the OpenScanHub job
• implement pre-check for the OSH results handler to check for matching identifiers (we might need to store the identifier in the DB)