tf-wrapper should handle both main branch for policy repo

[bharathkkb]

TL;DR

Some users may be using main branch for policy repo and our wrapper should support using it. Currently it fails with

Step #1 - "tf plan validate all":       At environment: envs/shared 
Step #1 - "tf plan validate all":       Using policy from: /workspace/policy-library 
Step #1 - "tf plan validate all": *****************************************************
Step #1 - "tf plan validate all": Cloning into '/workspace/policy-library'...
Step #1 - "tf plan validate all": warning: remote HEAD refers to nonexistent ref, unable to checkout.

/cc @jasonbisson

Expected behavior

No response

Observed behavior

No response

Terraform Configuration

N/A

Terraform Version

N/A

Additional information

No response

[henryb-shi]

This issue can be remediated by updating the name of the repo for gcp-policies in the tf-wrapper file

[github-actions[bot]]

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