fix(multi-package): add arrow to select

[scott-williams-az]

Description

Following bootstrap5, select elements should use form-select instead of form-control

Links

• Unity reference site - app-webdir-ui
• Unity reference site - app-degree-pages
• Unity reference site - unity-bootstrap-theme
• JIRA ticket
• Unity Design Kit

Checklist

• [x] Unity project successfully builds from root yarn install & yarn build
• [x] Commits do not contain multiple scopes
• [x] Add/updated examples
• [x] Add/updated READMEs/docs
• [x] No new console errors