test: [DI-30129] - Add spec for show details notification channel

[shnagend-akamai]

Description 📝

This PR introduces integration test coverage for the Notification Channel Show Details page in the CloudPulse Alerts section of the Linode Manager application.

Changes 🔄

Adds show details spec with integration tests for the Notification Channel Show Details page.
Covers detail validation, Associated Alerts table (search, filter, sort, pagination), and navigation to alert detail pages.
Handles error scenarios: 500 responses for channel/alerts fetches, empty alerts state, and channel load failure.
Adds API intercepts and enables all seven service types to prevent alerts from being filtered out during tests.
Also fixes few existing test specs to accept CloudPulseServiceMap updated values.

Target release date 🗓️

Upcoming release

Preview 📷

alert-show-notification-channel.spec.ts.2.mp4

How to test 🧪

pnpm cy:run -s "cypress/e2e/core/cloudpulse/alert-show-notification-channel.spec.ts"

Author Checklists

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

[kmuddapo]

LGTM

[linode-gh-bot]

Cloud Manager UI test results

🔺 5 failing tests on test run #8 ↗︎

❌ Failing	✅ Passing	↪️ Skipped	🕐 Duration
5 Failing	872 Passing	11 Skipped	46m 26s

Details

Failing Tests
	Spec	Test
❌	object-storage.e2e.spec.ts	Cloud Manager Cypress Tests→object storage end-to-end tests » can create and delete object storage buckets
❌	object-storage-objects-multicluster.spec.ts	Cloud Manager Cypress Tests→Object Storage Multicluster objects » can upload, access, and delete objects
❌	access-key.e2e.spec.ts	Cloud Manager Cypress Tests→object storage access key end-to-end tests » can create an access key with limited access - e2e
❌	account-switching.spec.ts	Cloud Manager Cypress Tests→Parent/Child account switching→From Child to Parent » can switch from Proxy user back to Parent account user from Billing page
❌	account-switching.spec.ts	Cloud Manager Cypress Tests→Parent/Child account switching→From Child to Child » can switch to another Child account as a Proxy user

Troubleshooting

Use this command to re-run the failing tests:

pnpm cy:run -s "cypress/e2e/core/objectStorage/object-storage.e2e.spec.ts,cypress/e2e/core/objectStorageMulticluster/object-storage-objects-multicluster.spec.ts,cypress/e2e/core/objectStorage/access-key.e2e.spec.ts,cypress/e2e/core/parentChild/account-switching.spec.ts"