print job logs when the job failed for debugging

[wwvela]

Issue #, if available:

• Add the job logs print for nvidia training, nvidia inference, neuron inference when the test failed which is easier for us to debugging the issue
• We already have the job log print for neuron training when it failed

  aws-k8s-tester/test/cases/neuron-training/bert_training_test.go

  Lines 102 to 109 in ecc47a9

  	if err := waitForJobCompletion(job, cfg); err != nil {
  	log.Printf("Job did not complete successfully: %v", err)
  	logsBuf, err := gatherJobLogs(ctx, cfg, "default", "bert-training")
  	if err != nil {
  	log.Printf("failed to get logs: %v", err)
  	} else {
  	log.Println(logsBuf.String())
  	}

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.