chore: migrate sdk-platform-java #16429

Job	Run time
owlbot-yaml	1m 2s
package_name_check	1m 3s
gitignore_correctness	1m 0s
root-pom	1m 50s
owlbot-py	1m 9s
generate-readme	1m 8s
gapic-bom	1m 42s
group_id_check_for_maps_libraries	7m 24s
	16m 18s

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