Not being able to add more than one ZIP file with JARs to Jet instance's classpath [HZ-4712]

[AleksPeychev]

Describe the bug
In a test we need to add more than one ZIP file with client specific JARs, it is impossible after this change, which sets resource ID to null. Before this change last path segment ("filename") was used as resource ID.

Expected behavior
More than one ZIP files wtih JARs being added to Jet instance's classpath.

To Reproduce

Steps to reproduce the behavior:

1. Add and Run the following test into com.hazelcast.jet.impl.deployment.AbstractDeploymentTest
   Or you can use the code directly from here.

   @Test
   public void addMoreJarsFromTwoZipFiles() throws Throwable {
       DAG dag = new DAG();
       dag.newVertex("load class", () -> new LoadClassesIsolated(true));

       JobConfig jobConfig = new JobConfig();
       jobConfig.addJarsInZip(this.getClass().getResource("/zip-resources/person-jar.zip"));
       jobConfig.addJarsInZip(this.getClass().getResource("/zip-resources/person-car-jar.zip"));

       executeAndPeel(getJet().newJob(dag, jobConfig));
   }

Actual behavior
java.lang.IllegalArgumentException: Resource with id:null already exists

Additional context

Stacktrace:

java.lang.IllegalArgumentException: Resource with id:null already exists

	at com.hazelcast.jet.config.JobConfig.add(JobConfig.java:1175)
	at com.hazelcast.jet.config.JobConfig.addJarsInZip(JobConfig.java:449)
	at com.hazelcast.jet.impl.deployment.AbstractDeploymentTest.addMoreJarsFromZipFiles(AbstractDeploymentTest.java:355)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at com.hazelcast.test.FailOnTimeoutStatement$CallableStatement.call(FailOnTimeoutStatement.java:115)
	at com.hazelcast.test.FailOnTimeoutStatement$CallableStatement.call(FailOnTimeoutStatement.java:107)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.lang.Thread.run(Thread.java:840)

[github-actions]

Internal Jira issue: HZ-4712