feat(installer): Source Packages from Cloudsmith

[curiositycasualty]

This change causes the installer script to source packages from Kong's new package hosting provider, Cloudsmith: https://packages.konghq.com

Wherever possible, I tried to reuse the existing log messages such that documentation should not need to be re-written. Features-wise, everything is the same except I also added latest as a possible input for VERSION (in addition to the existing preview).

Since the "release" package repos only contain 2.2.x+ and only support linux, darwin (kuma) and linux, darwin, and windows (kong-mesh), I initially thought I could drop the changes from: https://github.com/kumahq/kuma-website/pull/806/files (as discussed with @lahabana). But after some thought and some uploads of older packages to the Cloudsmith package repo "kuma-legacy" (a rough analogue to Pulp's "mesh-alpine"), it seemed feasible with little effort, so I went ahead and kept it.

Did you sign your commit? Instructions Yes

Have you read Contributing guidelines? Yes

Replaces: https://github.com/kumahq/kuma-website/pull/1609

KAG-2257

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[curiositycasualty]

Restored file to the workflow 😔 I expect this to pass when approved/ran.

[johnharris85]

LGTM