Missing 'Severity' filter in notification for vulnerabilities

**Describe the bug**
Earlier we used to have a filter called 'severity' in notification, which helped to filter only selected severity vuln. to be pushed as notification to slack, teams, etc. It's not present now.

**Screenshots**

**Components/Services affected**

- [x] UI/Frontend
- [ ] API/Backend
- [ ] Agent
- [ ] Deployment/YAMLs
- [ ] CI/CD Integration
- [ ] Other (specify)

**Additional context**
Add any other context about the problem here.