Name uploaded artifacts based on run id and attempt

[MakisH]

The archives are currently named runs.zip, which is vague and always the same, without including any information to find out more information about the origin of the file.

This PR:

• adds context that this comes from the system tests
• adds the run_id and the run_attempt in the name to make each archive unique
• uses this information instead of datetime as:
  • datetime requires more effort to extract and is more fragile
  • the run_id is the part that appears in the URL, so the user can find the job again
• distinguishes between a normal run and a run that generates reference results, but keeps the lexicographic order based on the run id.