[Security Solution] ESQL editor inserts random values on Enter in upgrade flyout

[xcrzx]

Summary

Random values are inserted when a user hits the Enter key in the ESQL editor within the rule upgrade flyout. See the video for illustration of the bug (I only pressing Enter repeatedly):

https://github.com/user-attachments/assets/02c92ba3-c2a2-40f7-8412-f5ad85d39bc2

This happens due to an invisible autosuggest field rendered outside the user's viewport. Hitting Enter pastes the first option from the autosuggest.

Additional Details

• This behavior is reproduced only in the ESQL editor inside the upgrade flyout.
• The same editor on the rule editing page is not affected by this issue.

[elasticmachine]

Pinging @elastic/security-solution (Team: SecuritySolution)

[elasticmachine]

Pinging @elastic/security-detection-rule-management (Team:Detection Rule Management)

[elasticmachine]

Pinging @elastic/security-detections-response (Team:Detections and Resp)