chore(job): delete old unused region tag after migration (#10012)

Author: alarconesparza

jobs/v3/src/main/java/com/google/samples/CustomAttributeSample.java

@@ -80,7 +80,6 @@ public static Job generateJobWithACustomAttribute(String companyName) {
   // [END job_custom_attribute_job]
 
   // [START job_custom_attribute_filter_string_value]
-  // [START custom_attribute_filter_string_value]
 
   /** CustomAttributeFilter on String value CustomAttribute */
   public static void filtersOnStringValueCustomAttribute()
@@ -112,11 +111,9 @@ public static void filtersOnStringValueCustomAttribute()
     Thread.sleep(1000);
     System.out.printf("Custom search job results (String value): %s\n", response);
   }
-  // [END custom_attribute_filter_string_value]
   // [END job_custom_attribute_filter_string_value]
 
   // [START job_custom_attribute_filter_long_value]
-  // [START custom_attribute_filter_long_value]
 
   /** CustomAttributeFilter on Long value CustomAttribute */
   public static void filtersOnLongValueCustomAttribute() throws IOException, InterruptedException {
@@ -148,7 +145,6 @@ public static void filtersOnLongValueCustomAttribute() throws IOException, Inter
     Thread.sleep(1000);
     System.out.printf("Custom search job results (Long value): %s\n", response);
   }
-  // [END custom_attribute_filter_long_value]
   // [END job_custom_attribute_filter_long_value]
 
   // [START job_custom_attribute_filter_multi_attributes]