Add k8s binaries to preloaded tarball

[priyawadhwa]

Include k8s binaries in preloaded tarball so that we can skip transferring this over.

This increases the size of the tarball from around 430 MB to 500MB, but saves a couple seconds on start time.

Fixes #6868

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: priyawadhwa

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [priyawadhwa]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[priyawadhwa]

/ok-to-test

[minikube-pr-bot]

All Times minikube: [ 91.345818 91.837129 90.856360]
All Times Minikube (PR 6870): [ 92.131489 92.148339 93.179699]

Average Minikube (PR 6870): 92.486509
Average minikube: 91.346436

Averages Time Per Log

+----------------------+-----------+--------------------+
|         LOG          | MINIKUBE  | MINIKUBE (PR 6870) |
+----------------------+-----------+--------------------+
| minikube v           |  0.220132 |           0.218688 |
| Creating kvm2        | 19.736280 |          19.887216 |
| Preparing Kubernetes | 49.436946 |          49.973889 |
| Pulling images       |           |                    |
| Launching Kubernetes | 20.748954 |          21.105703 |
| Waiting for cluster  |  0.053950 |           0.089263 |
+----------------------+-----------+--------------------+

[medyagh]

Looks good to me, please feel free to merge.