[Analytics:Graph page]Issues with options in the lists on create anomaly detection job from Patterns tab

[L1nBra]

Description
Existing options in the list has to be announced correctly, with correct total number, for users using assistive technology.

Preconditions
Analytics -> Graph page.
Create graph activated, fields are added.
Use Screen Reader (NVDA).

Steps to reproduce

1.Navigate to added field (f.e.: tags.raw).
2.Press Enter.
3.Navigate to Edit settings and press Enter.
4.Navigate to Field and press Enter.
5.Navigate through options in the opened dialog.
6.Observe page and screen reader.

UI elements + NVDA Speech Viewer

Actual Result

• Different total number of options are announced with existing options (f.e.: "...7 of 9", "...9 of 11"). Additional text is announced - options without the total number.

Expected Result

• Correct total number is announced with each existing option. No additional text - options without total number are announced.

Notes:
Similar with
-options for Icon field

Meta Issue

Kibana Version: 8.18.0-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 1.3.1: Info and Relationships (Level A)(https://www.w3.org/WAI/WCAG22/Understanding/info-and-relationships.html)

Related to: https://github.com/elastic/kibana-team/issues/1559

[elasticmachine]

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

[elasticmachine]

Pinging @elastic/kibana-graph (Feature:Graph)

[elasticmachine]

Pinging @elastic/kibana-visualizations (Team:Visualizations)