[Security:Cases:Settings page]Fields missing title from announcement

[L1nBra]

Description
Field visible title should be announced for the users, especially using assistive technology to know what is the purpose of the field, what user can enter/select.

Preconditions
Security -> Cases -> Settings page.
Use Screen Reader (NVDA).

Steps to reproduce

1.Navigate to Add template button.
2.Press Enter.
3.Navigate to Severity field.
4.Navigate to Description field.
5.Observe screen reader.

UI elements + NVDA Speech Viewer

Actual Result

• "Low menu button opens list" is announced, no announcement about Severity field itself.
  When reaching Description field - navigation instantly goes to "Bold button". No announcement about Description field itself.

Expected Result

• Severity field is correctly announced.
  For Description field would be better firstly to get focus on the whole field (editor) and announce it to the user, then navigation after pressing Tab key would move to Bold button which is inside in editor.

Meta Issue

Kibana Version: 8.17.0-SNAPSHOT

OS: Windows 11 Pro

Browser: Chrome Version 131.0.6778.140 (Official Build) (64-bit)

Screen reader: NVDA

WCAG or Vendor Guidance (optional)

• Understanding SC 4.1.2: Name, Role, Value (Level A)(https://www.w3.org/WAI/WCAG22/Understanding/name-role-value.html)
• Understanding SC 2.4.3: Focus Order (Level A)(https://www.w3.org/WAI/WCAG22/Understanding/focus-order.html)

Related to: https://github.com/elastic/kibana-team/issues/1280

[elasticmachine]

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

[elasticmachine]

Pinging @elastic/security-solution (Team: SecuritySolution)