"well-list" is removed from Bootstrap 4

The .well-list class is used in a bunch of places:

app/views/groups/projects.html.haml:  %ul.well-list
app/views/profiles/_event_table.html.haml:%ul.well-list
app/views/help/index.html.haml:      %ul.well-list
app/views/help/ui.html.haml:    %code .well-list
app/views/help/ui.html.haml:    %ul.well-list
app/views/help/ui.html.haml:      %ul.well-list
app/views/projects/pages/_list.html.haml:    %ul.well-list.pages-domain-list{ class: ("has-verification-status" if verification_enabled) }
app/views/projects/hooks/_index.html.haml:      %ul.well-list
app/views/admin/users/show.html.haml:      %ul.well-list
app/views/admin/users/show.html.haml:      %ul.well-list
app/views/admin/projects/show.html.haml:      %ul.well-list
app/views/admin/projects/show.html.haml:        %ul.well-list.content-list.members-list
app/views/admin/projects/show.html.haml:      %ul.well-list.project_members.content-list.members-list
app/views/admin/groups/show.html.haml:      %ul.well-list
app/views/admin/groups/show.html.haml:        %ul.well-list
app/views/admin/groups/show.html.haml:      %ul.well-list
app/views/admin/groups/show.html.haml:        %ul.well-list
app/views/admin/groups/show.html.haml:      %ul.well-list.group-users-list.content-list.members-list
app/views/admin/users/_profile.html.haml:  %ul.well-list
app/views/profiles/emails/index.html.haml:    %ul.well-list
app/views/profiles/keys/_key_details.html.haml:      %ul.well-list
app/views/profiles/keys/_key_table.html.haml:  %ul.well-list
app/views/profiles/gpg_keys/_key_table.html.haml:  %ul.well-list
app/views/events/event/_push.html.haml:    %ul.well-list.event_commits
app/views/sherlock/transactions/_general.html.haml:    %ul.well-list
app/views/sherlock/queries/_backtrace.html.haml:    %ul.well-list
app/views/sherlock/queries/_backtrace.html.haml:    %ul.well-list
app/views/sherlock/queries/_general.html.haml:    %ul.well-list
app/views/sherlock/queries/_general.html.haml:    %ul.well-list
app/views/sherlock/queries/_general.html.haml:    %ul.well-list
app/views/shared/milestones/_issuables.html.haml:  %ul{ class: "well-list milestone-#{class_prefix}-list", id: "#{class_prefix}-list-#{id}" }

This class has been removed as of Bootstrap 4, requiring the use of .list-group and .list-group-item instead. This breaks for example Sherlock's UI:

Using .list-group and .list-group-item turns this into the following:

cc @ClemMakesApps