[ML] Calendar form: Errors are not read by the screen reader

[aphelionz]

Steps to reproduce (assumes ChromeVox or similar)

1. Open Kibana in a new tab
2. Tab to Machine Learning
3. Tab to Settings
4. Tab to Calendar Management
5. Enter nothing in any field
6. Tab to Save, Press Enter

Actual Result
8. An error is shown but is not read to the user

Expected Result
8. The error is read to the user

Please note that this also applies to popup errors at the top of the screen, as shown below:

Category: #18866 Kibana 6.3 Meta Issues
Relevant WCAG Criteria: 3.3.1 Error Identification

[elasticmachine]

Pinging @elastic/ml-ui

[peteharverson]

This issue should be addressed by converting the Calendar management pages to EUI / React, and using the EUI toast for example to report errors.

[alvarezmelissa87]

This issue has been addressed with the conversion of Calendar management pages to EUI / React (#26741). As we are now using Eui Form controls, errors are read by the screen reader. Going to close this one off!