change: [M3-8531] - Hide Beta price notice for Gecko LA

[hana-akamai]

Description 📝

Gecko LA will be billed so we want to hide the temp Beta pricing notice if LA is enabled

Changes 🔄

List any change relevant to the reviewer.

• Hide Beta pricing notice in the Linode Plan table when a distributed region is selected for Gecko LA
• Rename GA references to LA

Preview 📷

Before	After

How to test 🧪

Prerequisites

(How to setup test environment)

• Ensure your account has the new-dc-testing, new-dc-testing-gecko, edge_testing and edge_compute customer tags
• Pull this PR and run it locally pointing to dev API

Verification steps

(How to verify changes)

• Select an image compatible with distributed regions (e.g. Ubuntu 24.04 LTS)
• Select a distributed region
• The Linode Plan table should not display the Beta pricing notice

Ensure Gecko Beta still shows the pricing notice.

• To test Gecko Beta locally, you can add the following to useFlags.ts (We do not want to change the LD flag globally since other teams rely on it):
• ...mockFlags,
  gecko2: {
  enabled: true,
  la: false
  }

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

[coliu-akamai]

✅ confirmed pricing notice NOT shown for LA distributed region
✅ confirmed pricing notice shown for beta