[Accessibility] Watcher code editors trap focus

[elasticmachine]

Original comment by @cjcenizal:

If you tab into the "Input Overrides" or "Watch JSON" code editors, you won't be able to tab backward or forward out of the editor. This is related to LINK REDACTED and both issues should be resolved with the same solution.

[elasticmachine]

Original comment by @chrisronline:

Looks like it's not supported at the Ace level: ajaxorg/ace#3149

[cjcenizal]

Still valid as of 6.4.

[elasticmachine]

Pinging @elastic/es-ui

[cjcenizal]

This was fixed awhile ago by changes to the EuiCodeEditor that allow the user to hit ESC to move focus out of the editor and resume tabbing through the form.