Merge branch '21146-windows-scrollbar' into 'master'

Remove ugly horizontal scrollbars in windows

## What does this MR do?
Removes horizontal scrollbars from pipelines view 

## Why was this MR needed?
It looked terrible.

## What are the relevant issue numbers?
Closes #21146

See merge request !5942

app/assets/stylesheets/pages/builds.scss

@@ -150,7 +150,7 @@
     border-top: 1px solid $border-color;
     border-bottom: 1px solid $border-color;
     max-height: 300px;
-    overflow: scroll;
+    overflow: auto;
 
     svg {
       position: relative;

app/assets/stylesheets/pages/merge_requests.scss

@@ -269,7 +269,7 @@
 
 .builds {
   .table-holder {
-    overflow-x: scroll;
+    overflow-x: auto;
   }
 }