[EuiToolTip] [A11y] Tooltips aren't announced to screen reader

[baileycash-elastic]

Reported by
@baileycash-elastic
@L1nBra

Describe the bug
Tooltip text has to be announced for the user, when it is additional text or instructions (not the repeat of element name). To better understand about the element, how to interact with it.

Impact and severity
defect-level-3

Components in use

• Code block with copy
• Standard EUI tooltip

Original Kibana issues blocked by defect
elastic/kibana#222511
elastic/kibana#222375

[weronikaolejniczak]

Hoping this gets fixed by removing the delay from the tooltip: #9552

If you have any other cases, please let me know 🙏🏻