chore(os-login): rm unused config API path #18007

Job	Run time
gapic-bom	1m 39s
generate-readme	1m 11s
gitignore_correctness	1m 7s
owlbot-yaml	1m 1s
owlbot-py	1m 15s
root-pom	1m 46s
package_name_check	59s
group_id_check_for_maps_libraries	8m 26s
	17m 24s

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