[SG-37324] Extract bootstrap style import @import 'bootstrap/scss/popover'

Created by: gitstart-sourcegraph

Problem statement

We depend on Bootstrap styles in our global styles a lot. But we don't plan to move forward with Bootstrap because we're working on our design system called Wildcard. To ease the transition to our styles and gain more control over visual changes, we want to move Bootstrap styles that we need into our codebase and eventually drop Bootstrap dependency.

Success criteria

• All highlighted imports has been removed
• All css rules currently used from the imports are now available in style sheets

Implementation details

• Remove bootstrap import @import 'bootstrap/scss/popover
• Copy style rules used in codebase from bootstrap stylesheet

Refs

• Gitstart ticket
• Sourcegraph issue

Test Plan

Find all usages of <Popover/> on code base and ensure there is no UI change

Loom Videos

• Popover video.
• FeedbackPrompt.
• Menu.
• ButtonDropdownCta.tsx

App preview:

• Web
• Storybook

Check out the client app preview documentation to learn more.