feat(bigquery): add internal listProjects API to core client #19845

Job	Run time
owlbot-yaml	1m 23s
gapic-bom	1m 54s
root-pom	1m 57s
generate-readme	1m 27s
package_name_check	1m 11s
owlbot-py	1m 23s
group_id_check_for_maps_libraries	9m 6s
gitignore_correctness	1m 24s
	19m 45s

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