chore: Disable ITPaginationTest.testPaginationIterating #15218

Job	Run time
gapic-bom	1m 22s
root-pom	1m 22s
group_id_check_for_maps_libraries	6m 49s
generate-readme	55s
package_name_check	48s
owlbot-py	52s
owlbot-yaml	44s
gitignore_correctness	44s
	13m 36s

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