Support darwin artifacts in the release process

[uri-weisman]

Motivation In the integration, we offer to install agent artifacts on Darwin. However, our current release procedure does not include the creation of binaries specifically for OSX.

Furthermore, it will improve local testing, allowing for the convenient download of the agent snapshot directly to your local environment. This eliminates the need of copying the Cloudbeat binary and other associated files, thus expediting the testing process.

Definition of done The user/dev is able to download the elastic agent binary for OSX and run it locally without any modifications.

• [ ] Update our release pipeline to create artifacts for the darwin/amd64, darwin/arm64 platforms as well.