Sort all vulnerabilities by Severity then Confidence for dashboard and Pipeline views

What does this MR do?

Sorts vulnerabilities for severity then confidence for dashboard and pipeline views #34114 (closed)

Does this MR meet the acceptance criteria?

Dashboard View

Pipeline View

Conformity

• Changelog entry
• Code review guidelines
• Style guides

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team