Merge pull request #4329 from lgoenner/executor

[JENKINS-57304] - Add call to oneOffExecutors.remove in Computer.removeExecutor

(cherry picked from commit cb424f3c)

core/src/main/java/hudson/model/Computer.java

@@ -1088,6 +1088,7 @@ public /*transient*/ abstract class Computer extends Actionable implements Acces
             public void run() {
                 synchronized (Computer.this) {
                     executors.remove(e);
+                    oneOffExecutors.remove(e);
                     addNewExecutorIfNecessary();
                     if (!isAlive()) {
                         AbstractCIBase ciBase = Jenkins.getInstanceOrNull();