fix(bqjdbc): Revert DatabaseMetaData field to be non-static in BigQueryConnection #17688

Job	Run time
generate-readme	1m 21s
gapic-bom	1m 3s
owlbot-yaml	1m 17s
owlbot-py	1m 26s
root-pom	1m 3s
gitignore_correctness	1m 3s
package_name_check	1m 5s
group_id_check_for_maps_libraries	8m 15s
	16m 33s

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