Update border radius of form controls and remove space above page titles

This commit makes changes to global CSS styles to bring the
product closer to compliance with Pajamas (the GitLab design system).

app/assets/stylesheets/framework/forms.scss

@@ -128,7 +128,7 @@ label {
 
 .form-control {
   @include box-shadow(none);
-  border-radius: 2px;
+  border-radius: $border-radius-default;
   padding: $gl-vert-padding $gl-input-padding;
 
   &.input-short {

app/assets/stylesheets/framework/page_title.scss

@@ -2,7 +2,6 @@
   @extend .d-flex;
   @extend .align-items-center;
 
-  padding-top: $gl-padding-top;
   border-bottom: 1px solid $border-color;
 
   .page-title {

changelogs/unreleased/nfriend-css-updates-for-gitlab-design-system-compliance.yml

+---
+title: Update `border-radius` of form controls and remove extra space above page titles
+merge_request: 24497
+author:
+type: fixed