fix: [UIE-10187], [UIE-10169] - IAM: error handling in remove dialog, wrong action menu options for delegate users

[mpolotsk-akamai]

Description 📝

This PR implements error handling when removing default role, hides "View User Detail" and "Delete User" options in action menu for delegate users.

Changes 🔄

List any change(s) relevant to the reviewer.

• implement error handling for RemoveAssignmentConfirmationDialog and UnassignRoleConfirmationDialog
• hide "View User Detail" and "Delete User" options in action menu for delegate users

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

Preview 📷

Before	After

How to test 🧪

Prerequisites

(How to setup test environment)

• use IAM Parent Account

Reproduction steps

(How to reproduce the issue, if applicable)

Action Menu fix:

• Switch to the Child Account form the Parent
• Go to /iam/users
• Click action menu for delegate user

Error Handling:

• Use Child Account
• Go to /iam/roles/defaults/roles
• Try to remove any role or entity with mocked API response returning error

Verification steps

(How to verify changes)

• Verify that "View User Detail" and "Delete User" options are hidden for delegate user.
• Verify that Error message is displayed.

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

🎉 866 passing tests on test run #3 ↗︎

❌ Failing	✅ Passing	↪️ Skipped	🕐 Duration
0 Failing	866 Passing	11 Skipped	39m 44s