Add feature to opt-in to get notifications for beta releases

[spowelljr]

Closes #10328

Added a new config option that the user can enable to get notified of beta releases.

The user can opt-in with the following command:

minikube config set WantBetaUpdateNotification true

Release script need to be updated to update the releases-beta.json file with the release version.

[minikube-bot]

Can one of the admins verify this patch?

[spowelljr]

Just realized that with the current logic, a older beta will take priority over a newer full release. Will resolve this conflict and add a test for it.

[medyagh]

lets change the get Names to proper go idiomatic and then looks good to me

[spowelljr]

/ok-to-test

[minikube-pr-bot]

kvm2 driver with docker runtime

+----------------+----------+---------------------+
|    COMMAND     | MINIKUBE | MINIKUBE (PR 11169) |
+----------------+----------+---------------------+
| minikube start | 51.5s    | 47.9s               |
| enable ingress | 39.4s    | 40.5s               |
+----------------+----------+---------------------+

Times for minikube (PR 11169) start: 47.2s 49.0s 48.4s 46.0s 49.0s
Times for minikube start: 51.2s 55.3s 49.5s 49.5s 52.1s

Times for minikube ingress: 43.3s 37.8s 36.8s 41.8s 37.7s
Times for minikube (PR 11169) ingress: 42.9s 35.8s 37.8s 44.3s 41.8s

docker driver with docker runtime

+----------------+----------+---------------------+
|    COMMAND     | MINIKUBE | MINIKUBE (PR 11169) |
+----------------+----------+---------------------+
| minikube start | 21.8s    | 21.6s               |
| enable ingress | 32.6s    | 36.6s               |
+----------------+----------+---------------------+

Times for minikube start: 21.8s 22.4s 21.7s 21.6s 21.6s
Times for minikube (PR 11169) start: 20.8s 21.2s 21.6s 21.9s 22.2s

Times for minikube ingress: 32.5s 33.0s 30.0s 34.0s 33.5s
Times for minikube (PR 11169) ingress: 37.5s 35.5s 36.0s 38.0s 36.0s

docker driver with containerd runtime

+----------------+----------+---------------------+
|    COMMAND     | MINIKUBE | MINIKUBE (PR 11169) |
+----------------+----------+---------------------+
| minikube start | 41.8s    | 46.3s               |
| enable ingress |          |                     |
+----------------+----------+---------------------+

Times for minikube start: 31.4s 43.5s 43.1s 43.5s 47.6s
Times for minikube (PR 11169) start: 46.8s 47.0s 44.0s 46.7s 47.1s

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: medyagh, spowelljr

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