feat(bigquery-jdbc): support custom OTel credentials and dynamic token refresh #19631

Job	Run time
root-pom	1m 49s
gitignore_correctness	1m 7s
gapic-bom	1m 48s
group_id_check_for_maps_libraries	8m 43s
owlbot-py	1m 19s
generate-readme	1m 14s
package_name_check	1m 11s
owlbot-yaml	1m 10s
	18m 21s

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