[WIP] Add L2 CRCR deployment configuration

[can-gaa-hou]

Summary

This PR is an extension of L1 (#433), and it only adds another AWS Lambda function and some environment variables for handling result callbacks from DownStream CI. It is also associated with L2 implementation (pytorch/test-infra#7967) and should only be merged after L2 implementation is completed.

File to change

.github/workflows/
├── crcr-on-pr.yml                  # Add result callback environment variables
└── crcr-deploy-prod.yml            # Add result callback environment variables
crcr/
├── Terrafile                       # Add result callback zip file download from test-infra
└── aws/ 
    ├── variables.tf                # Add result callback environment variables
    ├── outputs.tf                  # Add result callback AWS Lambda function
    ├── secrets.tf                  # Add result callback secrets
    └──result.tf                    # Add result callback AWS Lambda function configuration

Test

Multiple deployments and verifications have been completed on a personal AWS environment.

cc @fffrog