maven ExecutionEnvHelperTest test is causing sporadic CI timeouts

[mbien]

examples:

• https://github.com/apache/netbeans/actions/runs/8440986084/job/23119512724
• https://github.com/apache/netbeans/actions/runs/8663817225/attempts/1
• https://github.com/apache/netbeans/actions/runs/8763553601/job/24053368250#step:6:12831

happens during:

[junit] Testsuite: org.netbeans.modules.maven.runjar.ExecutionEnvHelperTest

those tests are usually stable, this began not too long ago (last third of NB 22 dev cycle)

cc @sdedic