Resolve "Code and Release - Platform Engineering solution page"

Step 1: What is changing in this MR?

• Takes components introduced here: !3674 (merged) and adapts them to be used in the Solutions Industry template for creating /solutions/platform-engineering
• Also updates solutions.service.ts to include the new components
• Adds a big update to /components/developer-experience/carousel.vue
• Creates new component /components/solutions/business-showcase.vue

Contentful Entry

Production	Review app
N/A	https://3184-platform-eng.about.gitlab-review.app/solutions/platform-engineering/

Pages using affected components

Production	Review app
N/A	https://3184-platform-eng.about.gitlab-review.app/solutions/developer-experience/

Step 2: Ensure that your changes comply with the following, where applicable:

• I, the Assignee, have run Axe tools on any updated pages, and fixed the relevant accessibility issues.
• These changes work on both Safari, Chrome, and Firefox.
• These changes have been reviewed for Visual Quality Assurance and Functional Quality Assurance on Mobile, Desktop, and Tablet.
• These changes work with our Google Analytics and SEO tools.
• These changes have been documented as expected.

Build Variables:

• Use Contentful Preview API

Related to #3184 (closed)