Provide ability to skip generating commits in changelog.json during prepare release

[bizob2828]

Description

The changelog.json with features, bug fixes and security fixes is only needed for the agent. This is used to generate the release notes for docs-website that adds the aforementioned sections as front matter. All of our other repos do not need this, thus we add an unncessary changelog.json to the repo.

Acceptance Criteria

Provide a cli option to bin/prepare-release.js that allows the agent to generate the changelog.json. Otherwise, do not do it.

Additional context

Once merged, we should go through all other repos and remove the changelog.json as it is not needed

[workato-integration]

https://new-relic.atlassian.net/browse/NR-255050