Update stylings for vulnerability findings

Description

Few styling updates for security findings webview:

1. Capitalize finding's severity value
2. Update favicon icon based on the designs (also fix typo in the filename)
3. other minor code updates

This updates the title and icon for security findings webviews.

Related Issues

Related epic: &10996 (closed)

How has this been tested?

Screenshots (if appropriate):

before	after

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