fix(jdbc bq): unshade BQ SDK in uber jar #16687

Job	Run time
package_name_check	58s
owlbot-yaml	59s
gapic-bom	1m 40s
root-pom	1m 37s
group_id_check_for_maps_libraries	7m 7s
gitignore_correctness	57s
generate-readme	1m 2s
owlbot-py	1m 6s
	15m 26s

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