(Accessibility) Filter language popover needs to identify `KQL` or `Lucene` as selected to screen readers

[1Copenut]

Steps to reproduce

1. Enable a sample data set in Kibana and navigate to the dashboard view 2.Turn on a screen reader like VoiceOver or NVDA
2. Tab to the "Saved query menu" button and press Enter
3. Tab through to the "Language: KQL, button" option and press Enter again
4. You should press Tab 2 more times when the second panel loads
5. You should hear "Kay Queue Ele, button" read aloud. The screen reader will not provide any indication this is the selected language.

Actual Result

• Screen reader announces "Kay Queue Ele, button"

Expected Result

• Screen reader announces a more descriptive label like "Kay Queue Ele, selected, button" OR
• "Kay Queue Ele, selected query language, button"

Possible code snippet

<button
  class="euiContextMenuItem"
  data-test-subj="kqlLanguageMenuItem"
  type="button">
  <span class="euiContextMenu__itemLayout">
    <svg
      aria-hidden="true"
      class="euiIcon euiContextMenu__icon css-e8xmlg-euiIcon-m-inherit"
      height="16"
      role="img"
      viewbox="0 0 16 16" width="16" xmlns="http://www.w3.org/2000/svg">
      <path d="M6.5 12a.502.502 0 01-.354-.146l-4-4a.502.502 0 01.708-.708L6.5 10.793l6.646-6.647a.502.502 0 01.708.708l-7 7A.502.502 0 016.5 12"
fill-rule="evenodd"></path>
    </svg>
    <span class="euiContextMenuItem__text">KQL</span>
!   <EuiScreenReaderOnly />
!   https://eui.elastic.co/#/utilities/accessibility#screen-reader-only
+   <span class="euiScreenReaderOnly">selected</span>
  </span>
</button>

Kibana Version: v8.8.0

OS: MacOS Monterey

Browser: Safari

Screen reader: [if relevant] VoiceOver

Relevant WCAG Criteria:

• Understanding SC 2.4.4: Link Purpose (In Context) (Level A)
• Understanding SC 1.3.1: Info and Relationships (Level A)

[elasticmachine]

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

[elasticmachine]

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