Expose skip property consistently

This commit makes sure that the `skip` command-line property can be used
for all goals of the maven plugin.

A dedicated sample for integration tests has also been added as this
change may confuse users, especially those who wish to skip a certain
goal and not the plugin execution altogether.

Closes gh-7313

spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/AbstractRunMojo.java

@@ -167,7 +167,7 @@ public abstract class AbstractRunMojo extends AbstractDependencyFilterMojo {
 	 * Skip the execution.
 	 * @since 1.3.2
 	 */
-	@Parameter(defaultValue = "false")
+	@Parameter(property = "skip", defaultValue = "false")
 	private boolean skip;
 
 	@Override

spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/StopMojo.java

@@ -75,7 +75,7 @@ public class StopMojo extends AbstractMojo {
 	 * Skip the execution.
 	 * @since 1.3.2
 	 */
-	@Parameter(defaultValue = "false")
+	@Parameter(property = "skip", defaultValue = "false")
 	private boolean skip;
 
 	@Override