Summary:
In preparation for removing vega-lite, I changed the tests to test the vega heavy spec.
In the process, I removed the property where the tests had the full spec enumerated so they could easily be placed in the online vega editor. Instead, I added a cli tool to reproduce this functionality.

Test Plan: Modified tests, tests pass.

Reviewers: nserrino, philkuz, #engineering

Reviewed By: philkuz, #engineering

Differential Revision: https://phab.corp.pixielabs.ai/D5435

GitOrigin-RevId: 57170875b2d90c71ad0057b04fd6181896f4beba