refactor: [M3-7661] - Remove linodeCloneUiChanges flag and clean up

[hkhalil-akamai]

Description 📝

Removes the linodeCloneUiChanges feature flag and permanently enables the associated changes.

Target release date 🗓️

5/13

Note

We don't want to merge this until we are sure we want to remove the feature flag. I am putting this PR up now so it's reviewed and ready when that time comes (expected to be 5/13).

How to test 🧪

Verification steps

Ensure all changes from the clone UI refactor still appear and work as expected:

• List view for selecting source linode
• Ability to filter based on linode label
• Auto filter to Linode when entering the clone flow through a Linode's actions menu
• Ability to power off linodes directly from the list when selected
• New notice with power off recommendation

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: 81.82%
Current Coverage: 81.82%