Fixes stylelint for page_title.scss

Replaces CSS with BS4 Utility classes

app/assets/stylesheets/framework/page_title.scss

 .page-title-holder {
-  @extend .d-flex;
-  @extend .align-items-center;
-
   border-bottom: 1px solid $border-color;
 
   .page-title {

app/views/dashboard/_activity_head.html.haml

-.page-title-holder
+.page-title-holder.d-flex.align-items-center
   %h1.page-title= _('Activity')
 
 .top-area

app/views/dashboard/_groups_head.html.haml

-.page-title-holder
+.page-title-holder.d-flex.align-items-center
   %h1.page-title= _('Groups')
 
   - if current_user.can_create_group?

app/views/dashboard/_projects_head.html.haml

 = content_for :flash_message do
   = render 'shared/project_limit'
 
-.page-title-holder
+.page-title-holder.d-flex.align-items-center
   %h1.page-title= _('Projects')
 
   - if current_user.can_create_project?

app/views/dashboard/_snippets_head.html.haml

-.page-title-holder
+.page-title-holder.d-flex.align-items-center
   %h1.page-title= _('Snippets')
 
   - if current_user && current_user.snippets.any? || @snippets.any?

app/views/dashboard/issues.html.haml

@@ -6,7 +6,7 @@
 
 = render_dashboard_gold_trial(current_user)
 
-.page-title-holder
+.page-title-holder.d-flex.align-items-center
   %h1.page-title= _('Issues')
 
   - if current_user

app/views/dashboard/merge_requests.html.haml

@@ -4,7 +4,7 @@
 
 = render_dashboard_gold_trial(current_user)
 
-.page-title-holder
+.page-title-holder.d-flex.align-items-center
   %h1.page-title= _('Merge Requests')
 
   - if current_user

app/views/dashboard/milestones/index.html.haml

@@ -2,7 +2,7 @@
 - page_title 'Milestones'
 - header_title 'Milestones', dashboard_milestones_path
 
-.page-title-holder
+.page-title-holder.d-flex.align-items-center
   %h1.page-title= _('Milestones')
 
   - if current_user

app/views/dashboard/todos/index.html.haml

@@ -4,7 +4,7 @@
 
 = render_dashboard_gold_trial(current_user)
 
-.page-title-holder
+.page-title-holder.d-flex.align-items-center
   %h1.page-title= _('Todos')
 
 - if current_user.todos.any?

app/views/groups/new.html.haml

@@ -3,7 +3,7 @@
 - page_title    _('New Group')
 - header_title  _("Groups"), dashboard_groups_path
 
-.page-title-holder
+.page-title-holder.d-flex.align-items-center
   %h1.page-title= _('New group')
 .row.prepend-top-default
   .col-lg-3.profile-settings-sidebar

app/views/snippets/new.html.haml

@@ -2,7 +2,7 @@
 - @hide_breadcrumbs = true
 - page_title _("New Snippet")
 
-.page-title-holder
+.page-title-holder.d-flex.align-items-center
   %h1.page-title= _('New Snippet')
 
 .prepend-top-default