test(datastore): Fix flaky ITE2ETracingTest by handling DeadlineExceededException #17361

Job	Run time
package_name_check	1m 0s
gapic-bom	1m 40s
owlbot-py	1m 11s
gitignore_correctness	1m 0s
group_id_check_for_maps_libraries	7m 58s
owlbot-yaml	1m 0s
generate-readme	1m 8s
root-pom	1m 44s
	16m 41s

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