Default Health status edit flag to true

Flip the feature flag to be true by default.

app/views/shared/issuable/_bulk_update_sidebar.html.haml

 - type = local_assigns.fetch(:type)
-- bulk_issue_health_status_flag = Feature.enabled?(:bulk_update_health_status, @project&.group) && type == :issues && @project&.group&.feature_available?(:issuable_health_status)
+- bulk_issue_health_status_flag = Feature.enabled?(:bulk_update_health_status, @project&.group, default_enabled: true) && type == :issues && @project&.group&.feature_available?(:issuable_health_status)
 - epic_bulk_edit_flag = @project&.group&.feature_available?(:epics) && type == :issues
 
 %aside.issues-bulk-update.js-right-sidebar.right-sidebar{ "aria-live" => "polite", data: { 'signed-in': current_user.present? } }

ee/app/views/shared/issuable/_group_bulk_update_sidebar.html.haml

 - group = local_assigns.fetch(:group)
 - type = local_assigns.fetch(:type)
-- bulk_issue_health_status_flag = type == :issues && Feature.enabled?(:bulk_update_health_status, group) && group&.feature_available?(:issuable_health_status)
+- bulk_issue_health_status_flag = type == :issues && Feature.enabled?(:bulk_update_health_status, group, default_enabled: true) && group&.feature_available?(:issuable_health_status)
 - epic_bulk_edit_flag = type == :issues && group&.feature_available?(:epics)
 
 %aside.issues-bulk-update.js-right-sidebar.right-sidebar{ 'aria-live' => 'polite', data: { 'signed-in': current_user.present? } }