Implemented default authentication in apps_script_ API

[RajeshGogo]

Description

Implemented Google default authentication in apps_script_api_execute region tag of apps_script API.
Fixes # (issue)

Has it been tested?

• Development testing done
• Unit or integration test implemented

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have performed a peer-reviewed with team member(s)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[sqrrrl]

While in general I'm OK with changing auth in quickstarts, this needs a little more thought + work on the docs side to update the quickstart instructions