Support build image in private networks by retrieving dependencies from s3 bucket

[hgreebe]

Description of changes

• Support build image in private networks
  • Retrieve dependencies from s3 bucket instead of the open internet

Tests

• Ran second-stage-build test on Jenkins

References

*Related cookbook change: aws/aws-parallelcluster-cookbook#2761

Checklist

• Make sure you are pointing to the right branch.
• If you're creating a patch for a branch other than develop add the branch name as prefix in the PR title (e.g. [release-3.6]).
• Check all commits' messages are clear, describing what and why vs how.
• Make sure to have added unit tests or integration tests to cover the new/modified code.
• Check if documentation is impacted by this change.

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