feat(spanner): add shared endpoint cooldowns for location-aware rerouting #17881

Job	Run time
owlbot-yaml	1m 1s
root-pom	1m 39s
owlbot-py	1m 15s
group_id_check_for_maps_libraries	8m 17s
gapic-bom	1m 40s
generate-readme	1m 4s
package_name_check	1m 4s
gitignore_correctness	1m 3s
	17m 3s

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