Ignore helpmojo from Eclipse m2e config

Ignore the `helpmojo` goal to save needing an additional Eclipse plugin.

spring-boot-parent/pom.xml

@@ -347,6 +347,7 @@
 										</versionRange>
 										<goals>
 											<goal>descriptor</goal>
+											<goal>helpmojo</goal>
 										</goals>
 									</pluginExecutionFilter>
 									<action>