PLT-6595 (Client): Elasticsearch indexing system console UI (#6991)

* PLT-6595: System Console for Elasticsearch Job Management.

* Fixing UI issues

* Fixing colors

* ESLint Fixes.

* Update test snapshots.

* Fixing cancel button

* Fix review comments.

* Config capitalisation.

* Review fixes.

webapp/sass/utils/_modifiers.scss

@@ -0,0 +1,33 @@
+@charset 'UTF-8';
+
+.margin--right {
+    margin-right: 5px;
+
+    &.x2 {
+        margin-right: 10px;
+    }
+}
+
+.margin--left {
+    margin-left: 5px;
+
+    &.x2 {
+        margin-left: 10px;
+    }
+}
+
+.padding--right {
+    padding-right: 5px;
+
+    &.x2 {
+        padding-right: 10px;
+    }
+}
+
+.padding--left {
+    padding-left: 5px;
+
+    &.x2 {
+        padding-left: 10px;
+    }
+}