Better empty states for the security dashboard and vulnerability report

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Related to gitlab-design#1730 (closed).

Problem to solve

The empty states for the security dashboard and vulnerability management pages are the same. This makes it difficult for users to infer how these features might differ once populated

Proposal

Provide more relevant empty states for the Security Dashboard and Vulnerability Report pages. This may be an opportunity to align with Jarek Ostrowski's UX showcase on rethinking empty states.

Edited by 🤖 GitLab Bot 🤖