fix: Don't show VirtualBox warning when auto-selected

[vamshi1188]

minikube should not warn users about VirtualBox driver when it was auto-selected rather than manually specified by the user.

Added DriverAutoSelected field to ClusterConfig to track whether the driver was automatically selected or manually chosen, and updated the VirtualBox warning logic to only show warnings for manually selected drivers.
Fixes #15456

Before (when VirtualBox was auto-selected)

😄  minikube v1.28.0 on Darwin 12.6.1
✨  Automatically selected the virtualbox driver. Other choices: ssh, qemu2 (experimental)
💿  Downloading VM boot image ...
👍  Starting "minikube" primary control-plane node in "minikube" cluster
🔥  Creating virtualbox VM (CPUs=2, Memory=3500MB, Disk=20000MB) ...
🐳  Preparing Kubernetes v1.25.3 on Docker 20.10.20 ...
    ▪ Generating certificates and keys ...
    ▪ Booting up control plane ...
    ▪ Configuring RBAC rules ...

╭──────────────────────────────────────────────────────────────────────────────╮
│                                                                              │
│ You have selected "virtualbox" driver, but there are better options!         │
│ For better performance and support consider using a different driver:        │
│     - qemu2                                                                  │
│                                                                              │
│ To turn off this warning run:                                                │
│     $ minikube config set WantVirtualBoxDriverWarning false                  │
╰──────────────────────────────────────────────────────────────────────────────╯

✅  Verifying Kubernetes components...


after:  "When VirtualBox is auto-selected"

             😄  [test-auto] minikube v1.36.0 on Ubuntu 24.04
            ✨  Automatically selected the virtualbox driver
            👍  Starting "test-auto" primary control-plane node in "test-auto" cluster
            💾  Downloading Kubernetes v1.33.2 preload ...
            🔥  Creating virtualbox VM (CPUs=2, Memory=3700MB, Disk=20000MB) ...
            🐳  Preparing Kubernetes v1.25.3 on Docker 20.10.20 ...
                ▪ Generating certificates and keys ...
                ▪ Booting up control plane ...
                ▪ Configuring RBAC rules ...
            ✅  Verifying Kubernetes components...
          

[linux-foundation-easycla]

• ✅login: vamshi1188 / (c7dfe85)

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @vamshi1188. Thanks for your PR.

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[minikube-bot]

Can one of the admins verify this patch?

[medyagh]

can you plz put before/after this PR in the Description

[vamshi1188]

can you plz put before/after this PR in the Description

i updated pr description with before/after