improvement(k8s): catch k3s connectivity error and retry

[vvagaytsev]

This is a quickfix for Quickstart example demo in the Google Cloud Shell.

What this PR does / why we need it:
A quickfix for #4460

Which issue(s) this PR fixes:

Fixes #4460

Special notes for your reviewer:

[shumailxyz]

@worldofgeese May be you can try it on the cloud shell? I guess it needs to be released first before it can be tried, right?

[vvagaytsev]

@worldofgeese May be you can try it on the cloud shell? I guess it needs to be released first before it can be tried, right?

If possible, would be nice to try it out before we release it. Is there a way to use a custom core build with the Cloud Shell @worldofgeese?

[worldofgeese]

@vvagaytsev there is! Just change the step in https://github.com/garden-io/quickstart-example/blob/main/start.sh that downloads the Garden binary to the pre-release then change the link in the Cloud Shell button to point to your branch ($BRANCH below)

[![Open in Cloud Shell](https://gstatic.com/cloudssh/images/open-btn.svg)](https://shell.cloud.google.com/cloudshell/editor?cloudshell_git_repo=https%3A%2F%2Fgithub.com%2Fgarden-io%2Fquickstart-example.git&cloudshell_git_branch=$BRANCH&cloudshell_open_in_editor=project.garden.yml&cloudshell_tutorial=tutorial.md&show=ide&ephemeral=true)