[Stateful:Connectors:Configuration page]Wrong announcement of Convert Connector button

[L1nBra]

Description When after user input changes happen on the page and previously present button is not there anymore - it should not be announced for the user as not to confuse him/her.

Preconditions Stateful Connectors -> Configuration page is opened. Connectors are added. Use Screen Reader (NVDA).

Steps to reproduce

1.Navigate to Convert connector button while using only keyboard by pressing Tab key. 2.Press Enter. 3.Navigate to Yes button. 4.Press Enter. 5.Observe the page. 6.Observe screen reader.

UI elements + NVDA Speech Viewer

Actual Result

• Changes occur on the page: there is no Convert connector button anymore, but screen reader announces it.

Expected Result

• Convert connector button is not announced.

Meta Issue

Kibana Version: 8.17.0-SNAPSHOT

OS: Windows 11 Pro

Browser: Chrome Version 130.0.6723.70 (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/search-team/issues/8256

[elasticmachine]

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