Revert "Do no render related tables in GET /api/v1/viz"

This reverts commit a1fda48ba3e8325b2aaa664d648fb1ea2d83f82d.
Revert "Optimize affected_visualization retrieval"

This reverts commit 190744f658a5e3f2d05d56976f26dcd746e4b9d7.
Revert "Memoize (almost) all the things related to visualizations"

This reverts commit 0ecba01487cefa7eab25994cdf7e0e4d7f035e4d.