Use a template string for the crictl download URL

[olavst-spk]

Pull Request (PR) description

This PR replaces the download_url parameter of the crictl class with a new parameter called download_url_template. This parameter uses template variables and is rendered using the k8s::format_url function, similar to how other download URLs are handled in this module.

The k8s::format_url function auto-detects the CPU architecture, so the arch parameter is no longer required. I am therefore removing it from the class.

NOTE: This is a breaking change for users that use the download_url parameter. Should this be noted somewhere?

This Pull Request (PR) fixes the following issues

Without templating, it is cumbersome to override the download URL. The user has to handle the version and arch themselves. It is also inconsistent with other parts of the module that use templating for download URLs.

[ananace]

I noted the k8s::format_url method for the PR that added the class as well, though unfortunately only after it had been merged.

Not sure if the ability to specify arch was a requirement at the time, so I'll leave @rwaffen to comment on that.

I feel like the method parameter could be useful here as well, so you can use both a direct binary url or an archive one, but that's just a personal feeling in regards to keeping things consistent - especially seeing as I don't use the crictl tooling myself. (Don't even know if direct binary download is a thing in this case)