[SNC-371] Sending compiled config in policy decide and eval subcommands

[sagar-connect]

Checklist

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• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
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Internal Checklist

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Changes

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• Sending compiled config in policy decide and eval subcommands
• Using testify framework in policy_test.go

Rationale

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history of changes

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[abdelDriowya]

LGTM
not sure how to test pipeline-parameters though

[sagar-connect]

LGTM not sure how to test pipeline-parameters though

Right.
The tests around pipeline-parameters aren't really relevant to these changes as they would be testing that they are parsed and sent to /api/v2 correctly. Since these changes are reusing cofig.ProcessConfig method for parsing the pipelines-parameters, it's relying on the existing tests around it.