chore(jdbc bq): makefile commands to run standalone IT tests #17296

Job	Run time
owlbot-py	1m 10s
owlbot-yaml	1m 1s
gapic-bom	1m 43s
generate-readme	1m 5s
gitignore_correctness	1m 0s
package_name_check	1m 1s
root-pom	1m 43s
group_id_check_for_maps_libraries	7m 52s
	16m 35s

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