Add tests to verify current schema is backward compatible #45
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All schema changes ought to be backwards compatible, as any usage would be prone to break any upgrade to cdn-definitions. Hence, add the test to validate historical data against current schema.
The historical data in tests/historical-data are the data.yamls that were present preceding any schema updates i.e. data-1.0.0.yaml has that data that was present when the schema was updated in v2.0.0., so the test could validate the old data against this updated schema. The files were named as per the cdn-definitions version when there was an update in the schema.