test(datastore): Retry QuerySplitter's getSplits for flaky calls #19715

Job	Run time
owlbot-py	1m 35s
package_name_check	1m 9s
generate-readme	1m 35s
owlbot-yaml	1m 23s
group_id_check_for_maps_libraries	9m 11s
root-pom	1m 50s
gitignore_correctness	1m 17s
gapic-bom	1m 56s
	19m 56s

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