Add testimonials single pattern (https://github.com/woocommerce/woocommerce-blocks/pull/9184)

* Add testimonials single pattern

* Fix invalid content

* Align message

plugins/woocommerce-blocks/patterns/testimonials-single.php

@@ -0,0 +1,29 @@
+<?php
+/**
+ * Title: Testimonials Single
+ * Slug: woocommerce-blocks/testimonials-single
+ * Categories: WooCommerce
+ */
+?>
+<!-- wp:columns -->
+<div class="wp-block-columns"><!-- wp:column {"width":"160px"} -->
+	<div class="wp-block-column" style="flex-basis:160px"><!-- wp:image {"align":"left","width":164,"height":164,"sizeSlug":"large","style":{"border":{"radius":"100%"}},"className":"is-style-rounded"} -->
+		<figure class="wp-block-image alignleft size-large is-resized has-custom-border is-style-rounded"><img src="https://s.w.org/images/core/5.8/portrait.jpg" alt="" style="border-radius:100%" width="164" height="164"/></figure>
+		<!-- /wp:image --></div>
+		<!-- /wp:column -->
+
+		<!-- wp:column {"layout":{"type":"default"}} -->
+		<div class="wp-block-column"><!-- wp:heading {"level":4,"style":{"typography":{"textTransform":"none","fontSize":"18px"}}} -->
+		<h4 class="wp-block-heading" style="font-size:18px;text-transform:none"><strong>Great experience</strong></h4>
+		<!-- /wp:heading -->
+
+		<!-- wp:paragraph {"style":{"typography":{"fontSize":"18px"}}} -->
+		<p style="font-size:18px">In the end the couch wasn't exactly what I was looking for but my experience with the Burrow team was excellent. First in providing a discount when the couch was delayed, then timely feedback and updates as the...
+		</p>
+		<!-- /wp:paragraph -->
+
+		<!-- wp:paragraph {"style":{"typography":{"fontSize":"18px"},"color":{"text":"#646970"}}} -->
+		<p class="has-text-color" style="color:#646970;font-size:18px">~ Anna W.</p>
+		<!-- /wp:paragraph --></div>
+	<!-- /wp:column --></div>
+<!-- /wp:columns -->