Resolve "Add record to vulnerability_finding_risk_score table when new vulnerability created"

What does this MR do and why?

This MR adds a new task to the vulnerability ingestion flow to create a new entry in the vulnerability_finding_risk_score table whenever a new vulnerability has been created

References

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #569092 (closed)