Because validation was added in [59134] to prevent submitting bulk actions with no selected action, sites that remove or change the default bulk actions can fail due to the missing required inputs. Add a filter (bulk_action_observer_ids) that allows modifying the actions accepted to fulfill validation rules.
Reviewed by Jorbin.
Merges [60186] to the 6.8 branch.
Props ethitter, kabir93, jorbin, davidbaumwald, joedolson.
Fixes#63005.
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