chore(bigtable): migrate java-bigtable to monorepo #18714

Job	Run time
root-pom	1m 57s
owlbot-yaml	1m 2s
gitignore_correctness	1m 31s
package_name_check	1m 21s
owlbot-py	1m 27s
gapic-bom	2m 31s
generate-readme	1m 16s
group_id_check_for_maps_libraries	9m 31s
	20m 36s

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