test: [M3-7771] - Add Placement Group populated landing page test

[jdamore-linode]

Description 📝

Adds a test to confirm the populated state of the Placement Group landing page. Specifically, confirms that each Placement Group is listed as expected and that non-compliance indicator is present when necessary (and absent otherwise).

Changes 🔄

• Adds Placement Group populated landing page test
• Adds a mock util that will be necessary but didn't actually get used

How to test 🧪

yarn cy:run -s "cypress/e2e/core/placementGroups/placement-groups-landing-page.spec.ts"

As an Author I have considered 🤔

Check all that apply

• 👀 Doing a self review
• ❔ Our contribution guidelines
• 🤏 Splitting feature into small PRs
• ➕ Adding a changeset
• 🧪 Providing/Improving test coverage
• 🔐 Removing all sensitive information from the code and PR description
• 🚩 Using a feature flag to protect the release
• 👣 Providing comprehensive reproduction steps
• 📑 Providing or updating our documentation
• 🕛 Scheduling a pair reviewing session
• 📱 Providing mobile support
• ♿ Providing accessibility support

[github-actions]

Coverage Report: ✅
Base Coverage: 82%
Current Coverage: 82%

[abailly-akamai]

Thanks for adding the test!