[DO NOT MERGE] HTTP log against real GCP API using direct controller for AlloyDBInstance

[maqiuyujoyce]

This PR is used to track test result and should not be merged.

Test log changes can be found in cd66b14. All the diffs in HTTP events against the AlloyDBInstance look reasonable.

1. All the dependent resources in test cases are fixed and are abandoned and required to save test time.
2. All the enum values in HTTP logs are now integers instead of strings.
3. Non-pointer bool fields in the requests in HTTP logs are captured with their default values, false.

[google-oss-prow]

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