Switch `test.single` to just run `mvn[d] test`

[jglick]

https://github.com/apache/netbeans/blob/45696ba6af2d663818daf33c49c3b2710e8d35e1/java/maven/src/org/netbeans/modules/maven/execute/defaultActionMappings.xml#L81-L93 tries too hard to optimize the mojos run for a test. Jenkins plugins tend to have more complicated setup, especially with jenkinsci/plugin-pom#1017. Simply mvn test suffices, and mvnd test is pretty fast if you install that.

netbeans-stapler-plugin/jenkins-plugin/src/main/resources/org/kohsuke/stapler/netbeans/jenkinsdev/action-mappings.xml

Line 2 in 714a93f

<actions>

could probably override this.