test: [UIE-10347] - Fix Cypress test failures following 1.159.0 release

[jdamore-linode]

Description 📝

This fixes a handful of failing Cypress tests following the 1.159.0 release and related feature flag changes. All of the failures stem around navigation changes and certain items being pushed below the fold as a result of the new "Partner Referrals" item being added.

Changes 🔄

• Fix Cypress test failures in smoke-linode-landing-table.spec.ts and alerting-notification-channel-permission-tests.spec.ts

Scope 🚢

Upon production release, changes in this PR will be visible to:

• All customers
• Some customers (e.g. in Beta or Limited Availability)
• No customers / Not applicable

Target release date 🗓️

N/A

How to test 🧪

We can rely on CI to confirm that the tests are passing.

As an Author, to speed up the review process, I considered 🤔

👀 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

• I have read and considered all applicable items listed above.

As an Author, before moving this PR from Draft to Open, I confirmed ✅

• All tests and CI checks are passing
• TypeScript compilation succeeded without errors
• Code passes all linting rules

[linode-gh-bot]

Cloud Manager UI test results

🎉 0 passing tests on test run #3 ↗︎

❌ Failing	✅ Passing	↪️ Skipped	🕐 Duration
0 Failing	0 Passing	0 Skipped	-Infinitys

[jdamore-linode]

Going to merge despite the CI failures, which are caused by a GH outage