fix: [UIE-10203], [UIE-10223], [UIE-10237] - IAM Delegate Users bug fix

[mpolotsk-akamai]

Description 📝

This PR fixes issues related to account switching and delegations: it ensures the default landing page is the Linodes page, correctly displays the delegate username in the top menu, fixes pagination bug in the User Delegations table.

Changes 🔄

List any change(s) relevant to the reviewer.

• Update the default landing page after switching accounts.
• Display the delegate user’s username instead of the parent user’s username in the top menu.
• Fix a pagination bug where pagination disappears after changing the page size to 50.

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

How to test 🧪

Prerequisites

(How to setup test environment)

• use Parent account

Verification steps

(How to reproduce the issue, if applicable)

• go to any page(ex. /firewalls)
• open User menu
• click Switch Account and select child account from the list
• verify that after switching account it redirects to the Linode landing page
• verify that delegate user’s username in displayed in top menu

Pagination:

• as parent user go to /iam/users/[username]/delegations for a user with more than 25 delegations.
• change page size to 50.
• verify that Pagination is visible.

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

[linode-gh-bot]

Cloud Manager UI test results

🔺 1 failing test on test run #6 ↗︎

❌ Failing	✅ Passing	↪️ Skipped	🕐 Duration
1 Failing	867 Passing	11 Skipped	42m 53s

Details

Failing Tests
	Spec	Test
❌	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/parentChild/account-switching.spec.ts"