Enhance logging to diagnose CpsFlowDefinitionRJRTest.flushLogsOnShutdown failure on Windows

Author: dwnusbaum

plugin/pom.xml

@@ -45,6 +45,7 @@
         <node.version>18.13.0</node.version>
         <npm.version>8.19.3</npm.version>
         <yarn.version>1.22.19</yarn.version>
+        <jenkins-test-harness.version>1926.v9b_323a_4da_421</jenkins-test-harness.version> <!-- Temporary, required to diagnose RJR issues due to https://github.com/jenkinsci/jenkins-test-harness/pull/544#issuecomment-1456707299 -->
     </properties>
     <dependencyManagement>
         <dependencies>

plugin/src/test/java/org/jenkinsci/plugins/workflow/cps/CpsFlowDefinitionRJRTest.java

@@ -1,5 +1,6 @@
 package org.jenkinsci.plugins.workflow.cps;
 
+import java.util.logging.Level;
 import org.jenkinsci.plugins.workflow.job.WorkflowJob;
 import org.jenkinsci.plugins.workflow.job.WorkflowRun;
 import org.junit.Rule;
@@ -25,6 +26,7 @@ private static void doesItSmoke(JenkinsRule r) throws Exception {
 
     @Test
     public void flushLogsOnShutdown() throws Throwable {
+        rjr.withLogger(CpsFlowExecution.class, Level.FINER);
         rjr.then(CpsFlowDefinitionRJRTest::flushLogsOnShutdownPreRestart);
         rjr.then(CpsFlowDefinitionRJRTest::flushLogsOnShutdownPostRestart);
     }