Add identifier column to the project security dash

What does this MR do?

Add identifier column to the project security dash

• take vulnerability identifiers and get primary identifer and display it
• conditionally render the column on the project-level security dashboard and not on the group/instance-level security dashboards
• add tests
• update docs

Screenshots

Before (plus the scanner column):

Project-level security dashboard

After:

Project-level security dashboard

Group/Instance-level security dashboards stay the same

Pipeline security tab stays the same

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

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
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

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

Closes #210327 (closed)