The CountActiveOwnerByOrganizationID query joins iam_membership_profiles with
iam_memberships, but used an unqualified tenant_id = @tenant_id in the WHERE
clause. Since both tables have a tenant_id column, PostgreSQL raised an
"ambiguous column" error when deleting an owner. Fixed by prefixing with the
table alias (p.tenant_id) to match the pattern used in CountByOrganizationID.
Added TestUser_RemoveOwner e2e test to verify one owner can remove another.
Signed-off-by: Bryan Frimin <bryan@getprobo.com>
