Merge branch 'btn-sm-side-margin-variable' into 'master'

Remove btn-sm-side-margin misc variable in favor of gitlab ui

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/126592



Merged-by: Justin Ho Tuan Duong <hduong@gitlab.com>
Approved-by: Justin Ho Tuan Duong <hduong@gitlab.com>
Approved-by: Tomas Bulva <tbulva@gitlab.com>
Reviewed-by: Justin Ho Tuan Duong <hduong@gitlab.com>
Co-authored-by: Taurie Davis <taurie@gitlab.com>

app/assets/stylesheets/framework/buttons.scss

@@ -126,16 +126,12 @@
 }
 
 @mixin btn-with-margin {
-  margin-left: $btn-side-margin;
+  @include gl-ml-3;
   float: left;
 
   &.inline {
     float: none;
   }
-
-  &.btn-sm {
-    margin-left: $btn-sm-side-margin;
-  }
 }
 
 @mixin btn-svg {

app/assets/stylesheets/framework/variables.scss

@@ -473,7 +473,6 @@ $border-radius-large: 8px;
 $default-icon-size: 16px;
 $layout-link-gray: #7e7c7c;
 $btn-side-margin: $grid-size;
-$btn-sm-side-margin: 7px;
 $count-arrow-border: #dce0e5;
 $general-hover-transition-duration: 100ms;
 $general-hover-transition-curve: linear;