refactor: remove unused Random.listOfEntityWithParentDto() method

Should be in 1d7c82d commit.

The following issue won't be fixed:
Closes #926

Part of #1668

src/test/java/ru/mystamps/web/service/TestObjects.java

@@ -17,7 +17,6 @@
  */
 package ru.mystamps.web.service;
 
-import ru.mystamps.web.common.EntityWithParentDto;
 import ru.mystamps.web.common.LinkEntityDto;
 import ru.mystamps.web.feature.account.AddUserDbDto;
 import ru.mystamps.web.feature.account.UserDetails;
@@ -127,12 +126,6 @@ public static EntityWithIdDto createEntityWithIdDto() {
 		return new EntityWithIdDto(Random.id(), TEST_ENTITY_NAME);
 	}
 
-	public static EntityWithParentDto createEntityWithParentDto() {
-		String name = Random.categoryName();
-		String parentName = Random.participantGroupName();
-		return new EntityWithParentDto(Random.id().toString(), name, parentName);
-	}
-
 	public static SeriesSalesParsedDataDbDto createSeriesSalesParsedDataDbDto() {
 		SeriesSalesParsedDataDbDto dto = new SeriesSalesParsedDataDbDto();
 

src/test/java/ru/mystamps/web/tests/Random.java

@@ -21,7 +21,6 @@
 import io.qala.datagen.RandomShortApi;
 import org.apache.commons.lang3.StringUtils;
 import ru.mystamps.web.common.Currency;
-import ru.mystamps.web.common.EntityWithParentDto;
 import ru.mystamps.web.common.SlugUtils;
 import ru.mystamps.web.feature.account.AccountValidation;
 import ru.mystamps.web.feature.category.CategoryValidation;
@@ -166,12 +165,6 @@ public static String participantName() {
 		).english();
 	}
 
-	// @todo #738 Random.participantGroupName(): make the generated names conform to
-	//  the validation rules (when they will appear)
-	public static String participantGroupName() {
-		return name();
-	}
-
 	public static String sellerName() {
 		return participantName();
 	}
@@ -241,18 +234,6 @@ public static List<EntityWithIdDto> listOfEntityWithIdDto() {
 		);
 	}
 
-	public static List<EntityWithParentDto> listOfEntityWithParentDto() {
-		final int minSize = 1;
-		final int maxSize = 3;
-		int size = integer(minSize, maxSize);
-		return sampleMultiple(
-			size,
-			TestObjects.createEntityWithParentDto(),
-			TestObjects.createEntityWithParentDto(),
-			TestObjects.createEntityWithParentDto()
-		);
-	}
-
 	public static String jsoupLocator() {
 		return sample("#id", "a[href]", "img[src$=.png]", "div#logo");
 	}