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
    ├── security.tf                 # Add security configuration
    └── callback.tf                 # Add result callback AWS Lambda function configuration

Test

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

cc @fffrog

[fffrog]

Great work, thank you.

[can-gaa-hou]

This PR can be merged once the following PR is merged:

• [CRCR] Initial implementation of L2 test-infra#7967 (required by callback lambda zip package)

[subinz1]

Reviewed against our RFC (RFC-0054) and HUD PR (test-infra#8069) — everything lines up: auth secrets, HUD API integration, Redis status tracking, and the dependency order on test-infra#7967. Great work @can-gaa-hou, thanks for putting this together!