Migrate security-dashboard vulnerability mutations specs to Jest

What does this MR do?

Migrates security-dashboard vulnerability mutations specs to Jest.

All credit for fixed typos goes to vscode-spell-checker.

Screenshots

n/a

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