Add IngressAttributes to PolicySetVersion #1076

[jpadrianoGo]

Description

This PR adds an new PolicySetVersion field, IngressAttributes struct with commit-sha,commit-url, and identifier fields. PolicySetVersion now includes IngressAttributes.

Testing plan

1. Generate the required environment variables for go test, TFE_ADDRESS and TFE_TOKEN
2. Run TFE_ADDRESS="https://example" TFE_TOKEN="example" go test ./... -v -run TestPolicySetVersionsRead. The existing test should pass.
3. IngressAttributes is read for PolicySetVersion.

External links

Output from tests

Including output from tests may require access to a TFE instance. Ignore this section if you have no environment to test against.

$ TFE_ADDRESS="https://example" TFE_TOKEN="example" go test ./... -v -run TestPolicySetVersionsRead

...

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