Update severity counters in project dashboard with new severity style

Background

From this issue: #34352 (closed)

We will need to update the style of the counters to reflect the new style of the severity labels.

Design

Current design

Proposal

• Update the counters to a new style:
  • title background: #fafafa
  • background: #ffffff
  • box-shadow: 0 2px 4px 0 rgba(0,0,0,0.16), 0 0 1px 0 rgba(0,0,0,0.08);
  • title: h3 #2e2e2e
  • number: h2 #2e2e2e
• Add severity icons to the single stat headers
• move counters to above the filters
• No behavioral change desired from what is in place today. This is just an aesthetic update