Improve kind install helper

[mboersma]

Description

The install_kind function defaulted to an old version and wasn't taking into account the platform architecture. This fetches the latest official release for the correct architecture.

I would default to "latest" instead of hard-coding a version, but that gets us a prerelease version:

% ./env/bin/kind version                                    
kind v0.18.0-alpha+7d26b50a129faf go1.19.3 darwin/arm64

I think it's safer to pin to a known-working version and update periodically than to use alpha builds of kind.

I've tested this locally.

History Notes

---

This checklist is used to make sure that common guidelines for an Azure CLI pull request are followed.

• [x] The PR title and description has followed the guideline in Submitting Pull Requests.
• [x] I adhere to the Command Guidelines.
• [x] I adhere to the Error Handling Guidelines.

[mboersma]

/hold

Need to test on an x86_64 platform.

[mboersma]

/hold cancel (yes, I know there's no bot here to process this command, but there should be)

Test on Mac amd64 and Linux x84_64.