Remove traces of opt-in mode to use improved hide heuristics. The
feature is now neither opt-in, nor opt-out. It is the new default
behavior that dropdowns are closed when there is anther FocusEvent.

Merge branch '2799-remove-traces-of-opt-in-mode-to-use-improved-hide-heuristics-setting-it-as-default' into 'main'

Resolve "Remove traces of opt-in mode to use improved hide heuristics, setting it as default"

Closes #2799

See merge request gitlab-org/gitlab-ui!4533



Merged-by: Mark Florian <mflorian@gitlab.com>
Approved-by: Martin Wortschack <mwortschack@gitlab.com>
Approved-by: Mark Florian <mflorian@gitlab.com>
Reviewed-by: Mark Florian <mflorian@gitlab.com>
Co-authored-by: Vanessa Otto <votto@gitlab.com>

# [90.2.0](gitlab-org/gitlab-ui@v90.1.0...v90.2.0) (2024-08-22)

### Features

* **BaseDropdown:** Listen on click and focusin to close dropdown ([d89d99d5](gitlab-org/gitlab-ui@d89d99d5))