chore(ci): Enable preview and stable deployments

[PeterSchafer]

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What does this PR do?

With this PR we are starting to deploy to different deployment channels (preview, candidate, stable/latest). The channels have been introduced before but were containing all the same deployment until now.

With this PR, continuous deployments that have so far been available via latest are now available via preview. Preview effectively serves as staging deployment and will be at regular points in time be promoted to candidate which will after stabilization be promoted to stable, which is an alias for latest.

Risk: Low to Medium as it affects the deployments but should not break anything.

Release Channels availability:

• stable / latest:
  • https://github.com/snyk/cli/releases/
  • https://static.snyk.io/cli/stable/
  • https://static.snyk.io/cli/latest/
  • npm
  • brew
  • scoop
• preview
  • https://static.snyk.io/cli/preview/
• release-candidate
  • https://static.snyk.io/cli/rc/

Where should the reviewer start?

How should this be manually tested?

Any background context you want to provide?

What are the relevant tickets?

Screenshots

Additional questions

[cmars]

LGTM, nonblocking question below