Bump CAPI version to v1.9.4

[2ez4szliu]

Issue #, if available: https://github.com/aws/eks-anywhere-internal/issues/2765

Description of changes:
Bump CAPI version from 1.8.5 to 1.9.4 to support k8s 1.32.

Notable changes in our patches:

• Removed patch 0001 Update coredns/corefile-migration to support 1.11.3 because upstream corefile-migration has been bumped to 1.0.25.
• In /internal/controllers/machine/machine_controller_phases.go: reconcilePhase function was removed and the logic of checking/updating machine status was moved into updateStatus(ctx context.Context, s *scope) in /internal/controllers/machine/machine_controller_status.go, we move the logic of setting etcd machine status to running into setMachinePhaseAndLastUpdated(_ context.Context, m *clusterv1.Machine) of machine_controller_status.go (this affects patch 0002 Add-unstacked-etcd-support.patch and patch 0020-Mark-etcd-machine-status-to-running-after-etcd-contr.patch)
  Reference PR: 11276
• Pause handling for in reconcileExternal was removed in this PR, so we also removed the pause handling for reconcileEtcdCluster(ctx context.Context, s *scope) in patch 0002 Add-unstacked-etcd-support.patch
• Need to update the control plane status in scope object in handlePauseControlPlaneWithExternalManagedEtcd(ctx context.Context, log logr.Logger, s *scope) when control plane is not found in patch 0003-Unstacked-etcd-and-controlplane-upgrade.patch, otherwise the reconcileDelete process will be stuck during control plane deletion stage and etcd cluster will never be deleted.

Testing
Ran TestVSphereKubernetes131Ubuntu2204SimpleFlow and TestVSphereKubernetes131BottlerocketLabelsUpgradeFlow, both passed.

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/hold