stats: raise error when loan is indexed while loan transition events … #1300

Job	Run time
Tests (ils, 3.9, pypi, postgresql14, opensearch2)	16m 59s
Tests (ill, 3.9, pypi, postgresql14, opensearch2)	3m 53s
Tests (acquisition, 3.9, pypi, postgresql14, opensearch2)	2m 34s
Tests (document_requests, 3.9, pypi, postgresql14, opensearch2)	2m 58s
Tests (circulation, 3.9, pypi, postgresql14, opensearch2)	8m 37s
	35m 1s

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