Update severity badges

Background:

From this issue: #34352 (closed) we are redesigning our severity badges to be more clear, quickly identifiable, scaleable, and accessible.

Proposal:

New badge designs:

Old badge	New badge	New badge color
		#8B2615
		#C0341D
		#FCA429
		#FDBC60
		#418CD8
		#919191

Text styling:

• Severity label text is always in GitLab's default paragraph style and color (unless defined otherwise)
• Severity label text is always sentence case (unless defined otherwise)
• Severity label text always has 8px padding between the icon and the severity text

Severity icon:

• Colors defined in table
• Icon is 12px x 12px

Locations to change:

These locations use the same list styling/component

Note: In the Dependency list all the items should be left aligned.

Location	Before	After
Project, Group, and Instance security dashboard, Pipeline vulnerability list	TBA
Vulnerability charts
Vulnerability modal
Dependency List