Update Threat Monitoring empty state

Why are we doing this work

Problem to solve

Inconsistent and improper use of button styles (some green, some blue) - buttons should be replaced with text links at the end of the description text).

Visual of changes

Changes needed	Screenshot
Threat monitoring - Button should be replaced with a More information text link at end of description.

Relevant links

Design Issue: #289295 (closed)

Non-functional requirements

• Documentation: Screenshot update on GitLab Security Dashboard, Security Center, and Vulnerability Reports
• Feature flag:
• Performance:
• Testing:

Implementation plan

• frontend Update code to have a text link at the end of the description instead of a button