ENGCOM-1790: [Forwardport] Use stored value of method instead of calling same method again. #15706

 - Merge Pull Request #15706 from dmytro-ch/magento2:2.3-develop-PR-port-15517
 - Merged commits:
   1. 83b3587
   2. 82d254b
   3. 42f3f2e

Author: magento-engcom-team

app/code/Magento/Marketplace/view/adminhtml/templates/partners.phtml

@@ -11,7 +11,7 @@
 $partners = $block->getPartners();
 ?>
 <?php if ($partners) : ?>
-    <?php foreach ($block->getPartners() as $partner) : ?>
+    <?php foreach ($partners as $partner) : ?>
         <div class="partner">
             <img
                 class="partner-image"