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This change modifies the validation logic for ServiceCIDR updates (`ValidateServiceCIDRUpdate`) to specifically permit upgrading a single-stack ServiceCIDR (either IPv4 or IPv6) to a dual-stack configuration. This reconfiguration path is considered safe because it only involves adding a new CIDR range without altering the existing primary CIDR. This ensures that existing Service IP allocations are not disrupted. Other modifications, such as: - Downgrading from dual-stack to single-stack - Reordering CIDRs in a dual-stack configuration - Changing the primary CIDR during a single-to-dual-stack reconfiguration remain disallowed by the validation. These operations carry a higher risk of breaking existing Services or cluster networking configurations. Preventing these updates automatically encourages administrators to perform such changes manually after carefully assessing the potential impact on their specific cluster environment. The validation errors and controller logs provide guidance when such disallowed changes are attempted. Change-Id: I41dc09dfddb05f277925da2262f8114d6accbd1d