feature: adds test and schema validations

[acouch]

Description

Adds tests and schema validation for report data generation.

JSON schemas for all files were added to tests/schemas. Because the items being tested involve querying BigQuery, it was difficult to do unit tests. I evaluated using tinyquery, however it did not seem worth the effort, as I was able to create a test that verifies the data is correct, and runs a minimal amount of queries in the warehouse.

Additionally, a reports/validate_reports.py file has been created which validates any report data in reports/outputs using the expected JSON schema.

Resolves #205, resolves #107, resolves #147

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation

How has this been tested?

Will have github action

• [x] create local tests and schema validation
• [x] create github action to test the tests and add linting
• [x] document testing

[acouch]

@atvaccaro great note. Didn't realize pydantic was used so heavily in data-infra. Looks like it wouldn't be too hard to switch to pydantic https://jsontopydantic.com/. Could do that in a follow-up ticket.