Add automation steps for cognito + RDS + S3 setup.

[goswamig]

What is the URL of the document? In this (cognito + s3 +RDS integration) url we did not talk about automation script similar to how we have had for cognito and S3 + RDS. We should merge or if there is a way to ideally re-use those automation script.

Which section(s) is the issue in? N/A What needs fixing and describe the solution you'd like? N/A

Additional context N/A