fix(kubetest2/eksapi): Fix 'unmanaged-nodegroup-efa.yaml' by removing references to SSHKeyPair

[mattcjo]

Issue #, if available:

Description of changes:
Remove references of SSHKeyPair in kubetest2/internal/deployers/eksapi/templates/unmanaged-nodegroup-efa.yaml which was causing the following error

Error: operation error CloudFormation: CreateStack, https response error StatusCode: 400, RequestID: 348672d1-12ce-4201-8f32-495f2198ae6b, api error ValidationError: Parameters: [SSHKeyPair] must have values

Testing
Successfully ran kubetest2 to create new cluster with two trn1.32xlarge nodes utilizing template kubetest2/internal/deployers/eksapi/templates/unmanaged-nodegroup-efa.yaml

docker run --rm -it \
  -e AWS_ACCESS_KEY_ID=${AWS_ACCESS_KEY_ID} \
  -e AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY} \
  -e AWS_SESSION_TOKEN=${AWS_SESSION_TOKEN} \
  -e AWS_DEFAULT_REGION=${AWS_DEFAULT_REGION} \
  -e AWS_PAGER="" \
  -v ${HOME}/.kube:/root/.kube \
  -v ${PWD}:/workspace \
  -w /workspace \
  aws-k8s-tester/kubetest2:fix-sshkeypair-1.31 \
  kubetest2 eksapi \
    --kubernetes-version ${KUBERNETES_VERSION} \
    --region ${REGION} \
    --instance-types ${INSTANCE_TYPE} \
    --unmanaged-nodes \
    --efa \
    --capacity-reservation \
    --node-creation-timeout ${NODE_CREATION_TIMEOUT} \
    --node-ready-timeout ${NODE_READY_TIMEOUT} \
    --emit-metrics \
    --ami ${AMI_ID} \
    --nodes=${NODE_COUNT} \
    --up \
    --user-data-format=${USER_DATA_FORMAT}
I1224 21:55:10.560614      15 app.go:61] The files in RunDir shall not be part of Artifacts
I1224 21:55:10.560741      15 app.go:62] pass rundir-in-artifacts flag True for RunDir to be part of Artifacts
I1224 21:55:10.560764      15 app.go:64] RunDir for this run: "/workspace/_rundir/${RUN_ID}"
I1224 21:55:10.563504      15 app.go:136] ID for this run: "${RUN_ID}"
I1224 21:55:10.563774      15 deployer.go:251] Using default IP family: ipv4
I1224 21:55:10.563793      15 deployer.go:275] Using default node name strategy: EC2PrivateDNSName
I1224 21:55:11.066714      15 infra.go:110] creating infrastructure stack with AZs: [${AZS}]
I1224 21:55:11.066757      15 infra.go:144] creating infrastructure stack...
I1224 21:55:11.609940      15 infra.go:149] waiting for infrastructure stack to be created: arn:aws:cloudformation:${REGION}:${ACCOUNT_ID}:stack/${STACK_NAME}/${STACK_ID}
I1224 21:58:11.334955      15 infra.go:159] getting infrastructure stack resources: arn:aws:cloudformation:${REGION}:${ACCOUNT_ID}:stack/${STACK_NAME}/${STACK_ID}
I1224 21:58:11.428756      15 infra.go:164] created infrastructure: &{vpc:${VPC_ID} subnetsPublic:[${SUBNET_PUBLIC_IDS}] subnetsPrivate:[${SUBNET_PRIVATE_IDS}] clusterRoleARN:arn:aws:iam::${ACCOUNT_ID}:role/${CLUSTER_ROLE_NAME} nodeRoleARN:arn:aws:iam::${ACCOUNT_ID}:role/${NODE_ROLE_NAME} nodeRoleName:${NODE_ROLE_NAME}}
I1224 21:58:11.428848      15 cluster.go:45] creating cluster...
I1224 21:58:13.469796      15 cluster.go:104] waiting for cluster to be active: ${CLUSTER_NAME}
    --user-data-format=${USER_DATA_FORMAT}
I1224 22:09:54.192255      15 cluster.go:109] cluster details: &{AccessConfig:<masked> Arn:<masked> CertificateAuthority:<masked> Endpoint:${CLUSTER_ENDPOINT} RoleArn:${CLUSTER_ROLE_ARN} Status:ACTIVE ...}
I1224 22:09:54.192390      15 cluster.go:113] cluster is active: arn:aws:eks:${REGION}:${ACCOUNT_ID}:cluster/${CLUSTER_NAME}
I1224 22:09:54.192463      15 kubeconfig.go:53] writing kubeconfig to /workspace/_rundir/${RUN_ID}/kubeconfig for cluster: arn:aws:eks:${REGION}:${ACCOUNT_ID}:cluster/${CLUSTER_NAME}
I1224 22:09:54.192956      15 kubeconfig.go:77] wrote kubeconfig: /workspace/_rundir/${RUN_ID}/kubeconfig
---
apiVersion: v1
kind: Config
clusters:
- cluster:
    certificate-authority-data: ${CERTIFICATE_AUTHORITY_DATA}
    server: ${CLUSTER_ENDPOINT}
  name: arn:aws:eks:${REGION}:${ACCOUNT_ID}:cluster/${CLUSTER_NAME}
contexts:
- context:
    cluster: arn:aws:eks:${REGION}:${ACCOUNT_ID}:cluster/${CLUSTER_NAME}
    user: arn:aws:eks:${REGION}:${ACCOUNT_ID}:cluster/${CLUSTER_NAME}
  name: arn:aws:eks:${REGION}:${ACCOUNT_ID}:cluster/${CLUSTER_NAME}
current-context: arn:aws:eks:${REGION}:${ACCOUNT_ID}:cluster/${CLUSTER_NAME}
preferences: {}
users:
- name: arn:aws:eks:${REGION}:${ACCOUNT_ID}:cluster/${CLUSTER_NAME}
  user:
    exec:
      apiVersion: client.authentication.k8s.io/v1beta1
      command: aws
      args:
      - eks
      - get-token
      - --cluster-name
      - ${CLUSTER_NAME}
I1224 22:09:54.194406      15 k8s.go:134] generated AuthMapRole
- username: system:node:{{EC2PrivateDNSName}}
  groups:
    - system:bootstrappers
    - system:nodes
  rolearn: arn:aws:iam::${ACCOUNT_ID}:role/${NODE_ROLE_NAME}
I1224 22:09:55.484874      15 node.go:149] using instance types: [${INSTANCE_TYPE}]
I1224 22:09:55.484913      15 node.go:417] creating unmanaged nodegroup with EFA stack...
I1224 22:09:55.650136      15 node.go:653] Using capacity reservation: ${CAPACITY_RESERVATION_ID}
I1224 22:09:55.816404      15 node.go:673] Using subnet: ${SUBNET_PRIVATE_ID}
I1224 22:09:56.563722      15 node.go:499] waiting for unmanaged nodegroup with EFA to be created: arn:aws:cloudformation:${REGION}:${ACCOUNT_ID}:stack/${STACK_NAME_UNMANAGED}/${STACK_ID_UNMANAGED}
I1224 22:13:05.388553      15 node.go:509] created unmanaged nodegroup with EFA stack: arn:aws:cloudformation:${REGION}:${ACCOUNT_ID}:stack/${STACK_NAME_UNMANAGED}/${STACK_ID_UNMANAGED}
I1224 22:13:05.388578      15 node.go:589] verifying AMI is ${AMI_ID} for ASG: ${ASG_NAME}
I1224 22:13:05.762699      15 node.go:603] verifying AMI for instances: [${INSTANCE_IDS}]
I1224 22:13:06.197777      15 node.go:621] ASG instances are using expected AMI: ${AMI_ID}
I1224 22:13:06.197801      15 k8s.go:53] waiting up to ${NODE_READY_TIMEOUT} for ${NODE_COUNT} node(s) to be ready...
I1224 22:13:06.598284      15 k8s.go:94] ${NODE_COUNT} node(s) are ready: map[${NODE_NAMES}]
I1224 22:13:07.105471      15 logs.go:38] --log-bucket is empty, no logs will be gathered!
I1224 22:13:07.373600      15 cloudwatch.go:79] emitted ${METRIC_COUNT} metrics to namespace: ${METRIC_NAMESPACE}

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.