fix(retail): add region tag for Java - Update setInventory.java (#10120)

* Update SearchWithPagination.java

* Update SetInventory.java

* Update retail/interactive-tutorials/src/main/java/product/SetInventory.java

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Update retail/interactive-tutorials/src/main/java/product/SetInventory.java

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Remove excess comments

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Katie McLaughlin <katie@glasnt.com>

Author: 3 people

retail/interactive-tutorials/src/main/java/product/SetInventory.java

@@ -16,6 +16,8 @@
 
 package product;
 
+// [START retail_set_inventory]
+
 import static setup.SetupCleanup.createProduct;
 import static setup.SetupCleanup.deleteProduct;
 import static setup.SetupCleanup.getProduct;
@@ -93,6 +95,8 @@ public static void setInventory(String productName) throws IOException, Interrup
             .build();
     System.out.printf("Set inventory request: %s%n", setInventoryRequest);
 
+    // [END retail_set_inventory]
+
     // To send an out-of-order request assign the invalid SetTime here:
     // Instant instant = LocalDateTime.now().minusDays(1).toInstant(ZoneOffset.UTC);
     // Timestamp previousDay = Timestamp.newBuilder()