Clean up utility class in commit search

Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/225990
Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/225833

Remove temporary utility class in utilities.scss.
Utilize responsive utility class.

app/assets/stylesheets/utilities.scss

@@ -117,8 +117,3 @@
 .gl-border-b-2 {
   border-bottom-width: $gl-border-size-2;
 }
-
-// Remove once this MR has been merged in GitLab UI >  https://gitlab.com/gitlab-org/gitlab-ui/-/merge_requests/1539
-.gl-min-w-full {
-  min-width: 100%;
-}

app/views/projects/commits/show.html.haml

@@ -24,7 +24,7 @@
 
         .control
           = form_tag(project_commits_path(@project, @id), method: :get, class: 'commits-search-form js-signature-container', data: { 'signatures-path' => namespace_project_signatures_path }) do
-            = search_field_tag :search, params[:search], { placeholder: _('Search by message'), id: 'commits-search', class: 'form-control search-text-input input-short gl-mt-3 mt-sm-0 gl-min-w-full', spellcheck: false }
+            = search_field_tag :search, params[:search], { placeholder: _('Search by message'), id: 'commits-search', class: 'form-control search-text-input input-short gl-mt-3 gl-sm-mt-0 gl-min-w-full', spellcheck: false }
         .control.d-none.d-md-block
           = link_to project_commits_path(@project, @ref, rss_url_options), title: _("Commits feed"), class: 'btn' do
             = icon("rss")