Update on Standard Library for gcloud and kubectl in Workflows

Hi,

This [README](https://github.com/GoogleCloudPlatform/workflows-demos/blob/ab2ce40ca7e3fef3584eb220cdc040f4f7e5e18c/workflows-executes-commands/using-standard-library/README.md) mentions that the integration of gcloud in the standard library is "currently in private preview."

I would ask if you could provide an update on whether the standard library is still in private preview or if it is now generally available. Also, what is the roadmap for this feature?

Additionally, can you confirm that the recommended way to use gcloud is to implement a dedicated block as shown in the [official example](https://github.com/GoogleCloudPlatform/workflows-demos/blob/ab2ce40ca7e3fef3584eb220cdc040f4f7e5e18c/workflows-executes-commands/using-cloudbuild-api/workflow-gcloud.yaml)?

Many thanks!

Start with workflows-executes-commands/using-standard-library/README.md and compare its private-preview statement with the official workflow-gcloud.yaml example in workflows-executes-commands/using-cloudbuild-api. Confirm the current availability, roadmap, and recommended gcloud usage with the project maintainers, then update the documentation once those decisions are established.

Written by the indexing model from the issue text.