tests

refactor: extract generic metaclass logic from ListResponse #375

Job	Run time
py unit tests	11s
py3.13 unit tests	9s
minimum dependency versions	12s
py3.10 unit tests	10s
py3.12 unit tests	9s
py3.11 unit tests	11s
py3.9 unit tests	10s
doc	12s
style	12s
py3.13 scim2-server downstream unit tests	15s
py3.13 scim2-tester downstream unit tests	15s
py3.13 scim2-cli downstream unit tests	16s
py3.13 scim2-client downstream unit tests	14s
py3.12 scim2-server downstream unit tests	18s
py3.12 scim2-tester downstream unit tests	12s
py3.12 scim2-client downstream unit tests	13s
py3.12 scim2-cli downstream unit tests	16s
py3.11 scim2-client downstream unit tests	14s
py3.11 scim2-cli downstream unit tests	17s
py3.11 scim2-server downstream unit tests	18s
py3.11 scim2-tester downstream unit tests	11s
	4m 35s

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