Move missing partial to shared directory

`autocomplete` partial is used in many places and it was outside the
shared directory.

src/api/app/views/webui/groups/_add_group_user_modal.html.haml

@@ -6,7 +6,7 @@
         .modal-header
           %h5.modal-title#add-group-user-modal-label Add Member
         .modal-body
-          = render partial: 'webui/autocomplete', locals: { html_id: 'user_login', label: 'User:',
+          = render partial: 'webui/shared/autocomplete', locals: { html_id: 'user_login', label: 'User:',
                                                             data: { source: autocomplete_users_path } }
         .modal-footer
           = render partial: 'webui/shared/dialog_action_buttons'

src/api/app/views/webui/shared/_autocomplete.html.haml

@@ -0,0 +1,16 @@
+:ruby
+  required = local_assigns.fetch(:required, true)
+  value = local_assigns.fetch(:value, '')
+  disabled = local_assigns.fetch(:disabled, false)
+  data = local_assigns.fetch(:data, {})
+
+.form-group.ui-front
+  = label_tag(html_id, label)
+  - if required
+    %abbr.text-danger{ title: 'required' } *
+  .input-group
+    .input-group-prepend
+      %span.input-group-text
+        %i.fas.fa-search
+    = text_field_tag(html_id, value, required: required, disabled: disabled, placeholder: 'Type to autocomplete...',
+                     class: 'obs-autocomplete form-control', data: data)