Generate property meta-data for test projects

Add annotation processor to `spring-boot-test` and
`spring-boot-test-autoconfigure`.

Fixes gh-6893

spring-boot-test-autoconfigure/pom.xml

@@ -121,6 +121,12 @@
 			<artifactId>spring-security-test</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<!-- Annotation processing -->
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-configuration-processor</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<!-- Test -->
 		<dependency>
 			<groupId>ch.qos.logback</groupId>

spring-boot-test/pom.xml

@@ -105,6 +105,12 @@
 			<artifactId>htmlunit</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<!-- Annotation processing -->
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-configuration-processor</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<!-- Test -->
 		<dependency>
 			<groupId>org.apache.tomcat.embed</groupId>