VMSS e2e test flake during drain

[CecileRobertMichon]

/kind bug

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What steps did you take and what happened:
[A clear and concise description of what the bug is.]

VMSS cluster test sometimes fails with:

1/24 Tests Failed. | expand_less
-- | --
capz-e2e: Workload cluster creation Creating a VMSS cluster [REQUIRED] with a single control plane node and an AzureMachinePool with 2 Linux and 2 Windows worker nodes expand_less23m13s/home/prow/go/src/sigs.k8s.io/cluster-api-provider-azure/test/e2e/azure_test.go:336 Unexpected error:     <*errors.StatusError \| 0xc00089f4a0>: {         ErrStatus: {             TypeMeta: {Kind: "", APIVersion: ""},             ListMeta: {                 SelfLink: "",                 ResourceVersion: "",                 Continue: "",                 RemainingItemCount: nil,             },             Status: "Failure",             Message: "nodes \"capz-e2e-e987kg-vmss-mp-0000000\" not found",             Reason: "NotFound",             Details: {                 Name: "capz-e2e-e987kg-vmss-mp-0000000",                 Group: "",                 Kind: "nodes",                 UID: "",                 Causes: nil,                 RetryAfterSeconds: 0,             },             Code: 404,         },     }     nodes "capz-e2e-e987kg-vmss-mp-0000000" not found occurred /home/prow/go/src/sigs.k8s.io/cluster-api-provider-azure/test/e2e/azure_machinepool_drain.go:204 | capz-e2e: Workload cluster creation Creating a VMSS cluster [REQUIRED] with a single control plane node and an AzureMachinePool with 2 Linux and 2 Windows worker nodes expand_less | 23m13s | /home/prow/go/src/sigs.k8s.io/cluster-api-provider-azure/test/e2e/azure_test.go:336 Unexpected error:     <*errors.StatusError \| 0xc00089f4a0>: {         ErrStatus: {             TypeMeta: {Kind: "", APIVersion: ""},             ListMeta: {                 SelfLink: "",                 ResourceVersion: "",                 Continue: "",                 RemainingItemCount: nil,             },             Status: "Failure",             Message: "nodes \"capz-e2e-e987kg-vmss-mp-0000000\" not found",             Reason: "NotFound",             Details: {                 Name: "capz-e2e-e987kg-vmss-mp-0000000",                 Group: "",                 Kind: "nodes",                 UID: "",                 Causes: nil,                 RetryAfterSeconds: 0,             },             Code: 404,         },     }     nodes "capz-e2e-e987kg-vmss-mp-0000000" not found occurred /home/prow/go/src/sigs.k8s.io/cluster-api-provider-azure/test/e2e/azure_machinepool_drain.go:204
capz-e2e: Workload cluster creation Creating a VMSS cluster [REQUIRED] with a single control plane node and an AzureMachinePool with 2 Linux and 2 Windows worker nodes expand_less | 23m13s
/home/prow/go/src/sigs.k8s.io/cluster-api-provider-azure/test/e2e/azure_test.go:336 Unexpected error:     <*errors.StatusError \| 0xc00089f4a0>: {         ErrStatus: {             TypeMeta: {Kind: "", APIVersion: ""},             ListMeta: {                 SelfLink: "",                 ResourceVersion: "",                 Continue: "",                 RemainingItemCount: nil,             },             Status: "Failure",             Message: "nodes \"capz-e2e-e987kg-vmss-mp-0000000\" not found",             Reason: "NotFound",             Details: {                 Name: "capz-e2e-e987kg-vmss-mp-0000000",                 Group: "",                 Kind: "nodes",                 UID: "",                 Causes: nil,                 RetryAfterSeconds: 0,             },             Code: 404,         },     }     nodes "capz-e2e-e987kg-vmss-mp-0000000" not found occurred /home/prow/go/src/sigs.k8s.io/cluster-api-provider-azure/test/e2e/azure_machinepool_drain.go:204

Example PR where this happened: #2119

What did you expect to happen:

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Environment:

• cluster-api-provider-azure version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):

[CecileRobertMichon]

/help

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@CecileRobertMichon:
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[CecileRobertMichon]

/assign @jackfrancis

to introduce retries