test: [M3-7434]: Add a Cypress test for OBJ Multicluster Bucket create flow

[jdamore-linode]

Description 📝

Adds a Cypress test to cover the OBJ Bucket creation flow when OBJ Multicluster is enabled. Using mock API data, it confirms that a bucket can be created, that Cloud uses a region ID rather than a cluster ID in its payload, and that the landing page updates to reflect the new bucket.

Changes 🔄

• Add a test for Bucket creation when OBJ Multicluster feature is enabled
• Update OBJ create mock util to be more consistent with other utils
• Add UI helper to find an autocomplete popper
• Add mock util for OBJ create error

How to test 🧪

We can rely on CI for this, or yarn cy:debug and search for object-storage.smoke.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: 81.33%
Current Coverage: 81.33%

[cpathipa]

LGTM!

[dwiley-akamai]

Test passed remotely and locally ✅