HAMLLint: Fix `FinalNewline` and `UnnecessaryStringOutput` errors

app/views/admin/licenses/_upload_buy_license.html.haml

 = link_to 'Buy License', "#{Gitlab::SUBSCRIPTIONS_URL}/plans", target: '_blank', rel: 'noopener noreferrer nofollow', class: "btn btn-new btn-inverted pull-right btn-buy-license"
-= link_to 'Upload New License', new_admin_license_path, class: "btn pull-right btn-upload-license append-right-10"
\ No newline at end of file
+= link_to 'Upload New License', new_admin_license_path, class: "btn pull-right btn-upload-license append-right-10"

app/views/admin/licenses/show.html.haml

@@ -38,7 +38,7 @@
           - if @license.will_expire?
             %strong= time_ago_with_tooltip(@license.expires_at)
             - if @license.trial?
-              %span= "(Free trial will expire in #{pluralize(@license.remaining_days, 'day')})"
+              %span Free trial will expire in #{pluralize(@license.remaining_days, 'day')}
           - else
             %strong Never
 

app/views/dashboard/projects/_blank_state_ee_trial.html.haml

@@ -13,4 +13,4 @@
       You can try these out for free without
       any obligation or payment details.
     = link_to new_trial_path, class: "btn btn-new" do
-      Start free trial
\ No newline at end of file
+      Start free trial

app/views/dashboard/projects/_blank_state_welcome.html.haml

@@ -45,4 +45,4 @@
         Public projects are an easy way to allow
         everyone to have read-only access.
       = link_to trending_explore_projects_path, class: "btn btn-new" do
-        Browse projects
\ No newline at end of file
+        Browse projects