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refactor(servicecidr): consolidate duplicates and use stdlib helpers

- Promote readyServiceCIDRs to util.ReadyServiceCIDRs so controller and
  daemon share one source of truth.
- Drop custom equalStringSlice in favour of slices.Equal.
- Extract vpcLbInitContainers helper to remove the symmetric v4/v6 init
  container blocks; container names keep the original
  init-ipv{4,6}-{route,iptables}-N format so existing rollouts diff cleanly.
- Use util.ObjectKind[*networkingv1.ServiceCIDR]() instead of the hardcoded
  string, mirroring the NAD discovery path.
- Collapse onServiceCIDRAdd/Update into a single onServiceCIDRChange.
- Drop the stopCh→ctx bridge in daemon's StartServiceCIDRInformerFactory
  and select on stopCh directly.
- Move the daemon's serviceCIDRInformerFactory construction into
  NewController so creation and startup are no longer tangled.

Net -68 lines, no behavior change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Signed-off-by: Mengxin Liu <liumengxinfly@gmail.com>