[Search:AppSearch:Users and roles page]When creating user and getting error, field in error should be in focus

[L1nBra]

Description
The field which is in error after filling and saving form (in this case adding user) should receive focus for user to instantly see where the error is and fix it faster.

Preconditions
Stateful App Search -> Users and roles page is opened.
Engine is added.
Existing user is added.

Steps to reproduce

1.Navigate to Add a new user button by pressing Tab key.
2.Press Enter.
3.Navigate to Username field.
4.Enter any text (f.e.: test).
5.Navigate to Email field.
6.Provide incorrect email structure (f.e.: [email protected]...sdfsdf...).
7.Navigate to Add user button.
8.Press Enter.
9.Press Tab key few times.
10.Observe Add a new user flyout.

Gif showing the issue

Actual Result

• Error is shown regarding email in the top of flyout. Focus is on the error itself.

Expected Result

• Better to have focus on the field which is in error, in this case Email field.

Meta Issue

Kibana Version: 8.17.0-SNAPSHOT

OS: Windows 11 Pro

Browser: Chrome Version 130.0.6723.70 (Official Build) (64-bit)

WCAG or Vendor Guidance (optional)

• Understanding SC 2.4.3: Focus Order (Level A)(https://www.w3.org/WAI/WCAG22/Understanding/focus-order.html)
• Understanding SC 3.3.1: Error Identification (Level A)(https://www.w3.org/WAI/WCAG22/Understanding/error-identification.html)

Related to: https://github.com/elastic/search-team/issues/8256

[elasticmachine]

Pinging @elastic/kibana-accessibility (Project:Accessibility)