Add missing attribute `user_notes_count` to merge requests (#542) #2064

Job	Run time
build_and_test (gitlab/gitlab-ee:15.4.6-ee.0, Release)	15m 38s
build_and_test (gitlab/gitlab-ee:15.11.9-ee.0, Release)	19m 30s
create_nuget	1m 8s
deploy	17s
	36m 33s

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