[ui] Fix Enter key behavior for tree outlines. For the ARIA tree role[^1], the Enter key is supposed to open or close parent nodes, but somehow this wasn't implemented for the general `TreeOutline` so far. [^1]: https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Roles/tree_role Fixed: chromium:1420362 Change-Id: I51e38c7a55861d2f24d80b0422cad2734f0dc40b Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/5046557 Auto-Submit: Benedikt Meurer <bmeurer@chromium.org> Commit-Queue: Simon Zünd <szuend@chromium.org> Reviewed-by: Simon Zünd <szuend@chromium.org>
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