chore(main): release 1.70.0-SNAPSHOT #15122

Job	Run time
gitignore_correctness	45s
owlbot-py	52s
gapic-bom	1m 23s
root-pom	1m 23s
owlbot-yaml	47s
generate-readme	49s
package_name_check	47s
group_id_check_for_maps_libraries	6m 4s
	12m 50s

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