[SNC-392] compile support for policy test command

[davidmdm]

Checklist

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• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have checked for similar issues and haven't found anything relevant.
• [x] This is not a security issue (which should be reported here: https://circleci.com/security/)
• [x] I have read Contribution Guidelines.

Internal Checklist

• [x] I am requesting a review from my own team as well as the owning team
• [x] I have a plan in place for the monitoring of the changes that I am making (this can include new monitors, logs to be aware of, etc...)

Changes

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• Updated the CircleCI-Public/circle-policy-agent
• Modified the circleci policy test command by adding the policy-agent compile function
  • calls the orbs-service API via graphql to compile test input
• Fixes a bug in the policy API client that was causing failures across tests
• adds the compily policy and test to validate the compilation is working in e2e fashion

Rationale

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To provide a better testing experience of CircleCI Config Policies, we needed to update the policy-agent that understood the compile and pipeline_parameters directive, and provide a compilation function for it to use.