Use Spring Framework's MockResolver implementation

Closes gh-42957

spring-boot-project/spring-boot-test/src/main/resources/mockito-extensions/org.mockito.plugins.MockResolver

@@ -1 +0,0 @@
-org.springframework.boot.test.mock.mockito.SpringBootMockResolver

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/mock/mockito/SpringBootMockResolverIntegrationTests.java

@@ -1,42 +0,0 @@
-/*
- * Copyright 2012-2024 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.boot.test.mock.mockito;
-
-import org.assertj.core.api.Condition;
-import org.junit.jupiter.api.Test;
-import org.mockito.internal.configuration.plugins.Plugins;
-import org.mockito.plugins.MockResolver;
-
-import static org.assertj.core.api.Assertions.assertThat;
-
-/**
- * Integration tests for {@link SpringBootMockResolver}.
- *
- * @author Andy Wilkinson
- * @deprecated since 3.4.0 for removal in 3.6.0
- */
-@SuppressWarnings("removal")
-@Deprecated(since = "3.4.0", forRemoval = true)
-class SpringBootMockResolverIntegrationTests {
-
-	@Test
-	void customMockResolverIsRegisteredWithMockito() {
-		assertThat(Plugins.getMockResolvers()).haveAtLeastOne(new Condition<MockResolver>(
-				SpringBootMockResolver.class::isInstance, "Spring Boot mock resolver instance"));
-	}
-
-}