querychecks: add tests

[stephybun]

Description

This PR

• updates the schema/attributes that the examplecloud resource and list resource returns
• adds test files and test cases for the various query checks

Rollback Plan

• If a change needs to be reverted, we will roll out an update to the code within 7 days.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

[stephybun]

Thanks for finishing up these tests @rainkwan!

I left a few clean up related comments that I think would be good to have addressed, either in this PR or in a follow up. The TestExpectKnownValue_ValueIncorrect should be updated though to correctly test an incorrect value.

[austinvalle]

Tests LGTM 🚀