refactor: [M3-8071] - Rename Edge Regions to Distributed Regions

[jaalah-akamai]

Description 📝

Effort to bring clarity to new regions and plan offerings

Changes 🔄

• Important: For our types and places we're checking for site_type, we're allowing both edge and distributed until the DB/API changes are ready. Then we'll do some cleanup afterwards.
• Everywhere we used the term edge will now be called distributed.
• In places where we only used the name/text edge, I've included region for clarity.
  • Example: type SupportedEdgeTypes => type SupportedDistributedRegionTypes

Target release date 🗓️

TBD: We will try to release this in conjunction with API changes

Preview 📷

Before	After
	📷

How to test 🧪

Prerequisites

• Pull down branch and ensure Gecko feature flag is active in dev tools

Reproduction steps

• Try to create a Linode in an edge/distributed region

• Observe edge should no longer be shown

• Using MSW, try to migrate an edge/distributed linode to a non-distributed region

• Observe warnings should be updated

As an Author I have considered 🤔

Check all that apply

• [x] 👀 Doing a self review
• [x] ❔ Our contribution guidelines
• [ ] 🤏 Splitting feature into small PRs
• [x] ➕ 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
• [x] 👣 Providing comprehensive reproduction steps
• [x] 📑 Providing or updating our documentation
• [ ] 🕛 Scheduling a pair reviewing session
• [ ] 📱 Providing mobile support
• [ ] ♿ Providing accessibility support

[github-actions[bot]]

Coverage Report: ✅
Base Coverage: 82.35%
Current Coverage: 82.35%