Improve Credentials page with platform-specific integration user guidance

[hunterachieng]

Short Description

Improved the Credentials page and Google Sheets/Drive adaptor docs with platform-specific integration user guidance, service account recommendations, and updated credential screenshots.

Closes #142

Details

Adds platform-specific integration user guidance to the Credentials page and relevant Google adaptor pages. The Credentials page now links out to Salesforce and Google Sheets for platform-specific advice rather than duplicating content.

The Google Sheets and Google Drive adaptor pages each gain a "Using a Google Service Account" section covering least-privilege scope recommendations and resource sharing, plus updated screenshots for both OAuth and access token credential types.

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[mtuchi]

@hunterachieng this not accurate, the raw access token is the OAuth 2.0 access token, Please revert this back to

Google Drive uses OAuth 2.0 access tokens for API authentication:

[hunterachieng]

@mtuchi I checked how we can add credentials for Google Drive and it uses both OAuth and you can add a raw access token on the creds page

[mtuchi]

@hunterachieng yes it's true you can add raw credential with any adaptor not only googlesheet, Are you saying it's possible to create a long lived access token from google cloud console ?

[hunterachieng]

No, the token only lives for 1 hour. Should I change and only focus on Oauth2?

[mtuchi]

@hunterachieng Yes, i think the way it was before is fine, we can add a foot note saying If you need to test the adaptor locally you, you can generate a 1hour token using gcloud cli

[mtuchi]

Hey @hunterachieng i left some comments in googledrive adaptor can you work on those and see if also you the other adaptor need the same changes