Lowers the z-indexing of the pipeline drawer

This brings it below the header so the header elements are still visible

app/assets/javascripts/pipeline_editor/components/drawer/pipeline_editor_drawer.vue

@@ -68,7 +68,7 @@ export default {
   <local-storage-sync v-model="isExpanded" :storage-key="$options.localDrawerKey" as-json>
     <aside
       aria-live="polite"
-      class="gl-fixed gl-right-0 gl-bg-gray-10 gl-shadow-drawer gl-transition-medium gl-border-l-solid gl-border-1 gl-border-gray-100 gl-h-full gl-z-index-9999 gl-overflow-y-auto"
+      class="gl-fixed gl-right-0 gl-bg-gray-10 gl-shadow-drawer gl-transition-medium gl-border-l-solid gl-border-1 gl-border-gray-100 gl-h-full gl-z-index-3 gl-overflow-y-auto"
       :style="rootStyle"
     >
       <gl-button

changelogs/unreleased/pipeline-drawer-z-indexing.yml

+---
+title: Lowers the z-indexing of the pipeline drawer
+merge_request: 61683
+author:
+type: other