Show vulnerability counts for security findings

Description

1. Adds the count next to the security findings group node
2. Displays the grouping even when count is zero

Related Issues

Resolves gitlab#425360 (closed)

How has this been tested?

Screenshots (if appropriate):

Before:

After:

state	screenshot
Expanded state
Collapsed state

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation
• Chore (Related to CI or Packaging to platforms)
• Test gap