feat: [UIE-8819] - IAM RBAC: User Email validation

[mpolotsk-akamai]

Description 📝

Updated email validation in the User Email Panel to match the backend's validation logic.

Changes 🔄

List any change(s) relevant to the reviewer.

• Added regex email validation to match backend.
• Added a unit test.

Added a unit test to verify the validation displays the correct error message.

Target release date 🗓️

June 24th

How to test 🧪

Prerequisites

(How to setup test environment)

• Ensure the Identity and Access Beta flag is enabled in dev tools
• Use devenv and login as vagrant user

Verification steps

(How to verify changes)

• Go to the “Email” section in the IAM User Details Tab.
• Enter an invalid email like user#@example.com.
• Click Save.
• Ensure a validation message appears: Invalid email address.

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 unit tests are passing
• TypeScript compilation succeeded without errors
• Code passes all linting rules

[linode-gh-bot]

Cloud Manager UI test results

🔺 3 failing tests on test run #3 ↗︎

❌ Failing	✅ Passing	↪️ Skipped	🕐 Duration
3 Failing	661 Passing	4 Skipped	130m 36s

Details

Failing Tests
	Spec	Test
❌	vpc-linodes-update.spec.ts	Cloud Manager Cypress Tests→VPC assign/unassign flows » VPC assign/unassign flows
❌	vpc-create.spec.ts	Cloud Manager Cypress Tests→VPC create flow » VPC create flow
❌	vpc-create.spec.ts	Cloud Manager Cypress Tests→VPC create flow » VPC create flow

Troubleshooting

Use this command to re-run the failing tests:

pnpm cy:run -s "cypress/e2e/core/vpc/vpc-linodes-update.spec.ts,cypress/e2e/core/vpc/vpc-create.spec.ts"