test(bigquery-jdbc): add e2e otel test and code refinements #19168

Job	Run time
generate-readme	1m 23s
package_name_check	1m 23s
group_id_check_for_maps_libraries	9m 2s
owlbot-yaml	1m 26s
owlbot-py	1m 12s
gapic-bom	2m 8s
gitignore_correctness	1m 25s
root-pom	1m 50s
	19m 49s

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