Support observed state validation via GitHub action

[maqiuyujoyce]

Change description

Leveraged the VCR testing and the golden object comparison to verify that observed state fields are populated properly after a successful reconciliation.

Added the observed state test into the presubmit test.

Added instructions about how to generate observed state test data.

Tests you have done

• [N/A] Run make ready-pr to ensure this PR is ready for review.
• [N/A] Perform necessary E2E testing for changed resources.

[google-oss-prow]

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[acpana]

I may be missing some more context here but why can't we rely on the existing golden objects exports GOLDEN_OBJECT_CHECKS=1 in our fixtures and samples ?

[maqiuyujoyce]

Good point! I used VCR originally because there was no mock for the specific resources at the time when I started working on it or the mock doesn't populate all the fields I want. Will take a look at the mock.