fix(iam-admin): remove redundant IAM project service to prevent state conflict #18742

Job	Run time
generate-readme	1m 13s
group_id_check_for_maps_libraries	7m 24s
gitignore_correctness	56s
root-pom	1m 41s
gapic-bom	1m 47s
owlbot-yaml	1m 3s
package_name_check	58s
owlbot-py	1m 5s
	16m 7s

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