[Integ] Modify Proxy.yaml to enable creation of Proxy for Build Image

* Use EnableBuildImageProxy to distinguish between Build Image Proxy and Cluster Proxy (default)
* [DevSetting] Use install_http_proxy_address for setting up Proxy environment during build image
* Add snap store allowlist to overcome dpkg lock issue when installing DCV
* Enable IP forwarding to avoid Kernel dropping packets in ConfigureSystem Step of parallelcluster.yaml
* allowlist for awscli cloudfront url and global s3 endpoint
* Add access to FSX repos, efa installer, Rust and Index which are pre-req for Efs-utils using tiny proxy allowlist
* Skip awsbatch cli
* Add AmazonS3ReadOnlyAccess so that Presigned URL for S3 Node package is created
* using s3 bucket url to avoid proxy connection issue for github endpoint

```
url -sS -L -w '%{http_code}' -o /etc/chef/aws-parallelcluster-cookbook.tgz https://github.com/aws/aws-parallelcluster-cookbook/tarball/refs/heads/develop
curl: (35) OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to github.com:443
```
* Upgrade Proxy instance OS to ubuntu22

Author: Himani Anil Deshpande