feat: return organization_name on OrganizationMembership #1648

Job	Run time
Test Python 3.14	51s
Test Python 3.11	25s
Test Python 3.9	26s
Test Python 3.10	30s
Test Python 3.8	34s
Test Python 3.13	28s
Test Python 3.12	34s
Smoke test (Python ${{ matrix.python }})	0s
	3m 48s

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