[Observability:Rules page]Incorrect announcement when selecting option

[L1nBra]

Description
When checking options - state change has to be correctly announced that user, using screen reader, would know that he successfully selected/unselected option.

Preconditions
Observability -> Rules page.
Use Screen Reader (NVDA).

Steps to reproduce

1.Navigate to Type.
2.Press Enter.
3.Select few options (press Enter on them)
4.Observe screen reader.

UI elements + NVDA Speech Viewer

Actual Result

• No announcement that it was selected/unselected is made. Checked option is announced as "not selected".

Expected Result

• When selecting/unselecting option - it is announced accordingly as selected/unselected. When user navigate to already selected option - it is announced as "selected".

Notes:
Similar with
-options in Response dialog

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)

Related to: https://github.com/elastic/kibana-team/issues/1254

[elasticmachine]

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