chore(ci): mark github releases as pre-release

[phated]

Related issue(s)

Resolves #

Description

Summary of changes

This marks the GitHub Release that is produced by Release-Please as a "Pre-release" (see https:/phated/phated/releases for an example).

Noirup and our various guides utilize the "latest" release because GitHub provides a handy redirect: https:/noir-lang/noir/releases/latest and sometimes the docs and demos lag behind. This change allows the previous release to be marked as "latest" until we manually update the GitHub Release to be latest (such as when documentation is done).

Note: In the PR that added this feature on Release-Please, they restricted it to 0.x.x versions, which would not work for our workflow after 1.0; however, I think this decision was arbitrary and I'll work with them to allow this to be applied to any release versions.

Dependency additions / changes

Test additions / changes

Checklist

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt with default settings.
• I have linked this PR to the issue(s) that it resolves.
• I have reviewed the changes on GitHub, line by line.
• I have ensured all changes are covered in the description.

Documentation needs

• This PR requires documentation updates when merged.

Additional context