test: [M3-7792, M3-7793, & M3-7794] - Cypress tests for Placement Group Linode assignment and unassignment

[jdamore-linode]

Description 📝

Adds a handful of Cypress integration tests for Placement Group Linode assignment flows.

• Confirms that Linodes can be assigned to Placement Group
• Confirms UI behavior when assigning a Linode that puts a weakly-enforced Placement Group into non-compliance
• Confirms UI behavior when attempting to assign a Linode that would put a strictly-enforced Placement Group into non-compliance
• Confirms that Linodes can be unassigned from Placement Group via its details page

Changes 🔄

• Adds assignment tests in cypress/e2e/core/placementGroups/placement-groups-linode-assignment.spec.ts
• Adds a couple Placement Group intercept utils in cypress/support/intercepts/placement-groups.ts

How to test 🧪

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

Alternatively, you can run the tests interactively with 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%

[hana-akamai]

Confirmed all tests passed ✅