test: [M3-7772] - Add Cypress integration test for Placement Group create flow

[jdamore-linode]

Description 📝

Adds a Cypress integration test for basic Placement Group create flow. It confirms that a Placement Group can be created from the landing page, that the outgoing API request contains the expected payload, and that Cloud responds as expected by showing a toast and updating its content upon successful Placement Group creation.

Changes 🔄

• Adds PG create test in cypress/e2e/core/placementGroups/create-placement-groups.spec.ts
• Adds PG create mock util

How to test 🧪

yarn && yarn build && yarn start:manager:ci, and then:

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

Alternatively, you can run the test via yarn cy:debug.

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: 82.01%
Current Coverage: 82.01%

[dwiley-akamai]

Test passes ✅
Code review ✅