build: only run code formatter with JDK 11 and higher (GoogleCloudPlatform#3121)

Author: olavloite

pom.xml

@@ -383,6 +383,27 @@
         </plugins>
       </build>
     </profile>
+    <profile>
+      <id>format</id>
+      <activation>
+        <jdk>[11,)</jdk>
+      </activation>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>com.coveo</groupId>
+            <artifactId>fmt-maven-plugin</artifactId>
+            <executions>
+              <execution>
+                <goals>
+                  <goal>format</goal>
+                </goals>
+              </execution>
+            </executions>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
   </profiles>
 
   <build>
@@ -409,17 +430,6 @@
         </configuration>
       </plugin>
 
-      <plugin>
-        <groupId>com.coveo</groupId>
-        <artifactId>fmt-maven-plugin</artifactId>
-        <executions>
-          <execution>
-            <goals>
-              <goal>format</goal>
-            </goals>
-          </execution>
-        </executions>
-      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>