Update SAST Configuration UI collapse/ accordion component

Problem to solve

SAST Configuration UI was built with the expandable container component that was removed from Pajamas. (See !40639 (comment 409289794) for context.)

Solution

Update to the accordion component.

Before	After

Changes:

• Expand/ collapse button removed
• A chevron is added next to the title; both areas are blue and can be clicked to expand/ collapse the section below
• The "?" icon is removed from title and the link is added to the description underneath with a More information text link

Design

TBD

/cc @tmccaslin for awareness