Remove ruby files and regen tests (#1501)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1501

Now that we have `gentest-driver.ts` we can delete the ruby gentest. I also regened all of the tests that have a comment with the wrong file name for where it was generated.

Reviewed By: yungsters, NickGerleman

Differential Revision: D51956567

fbshipit-source-id: d389492e54711cf161dff9e649396cc40f1e5073

gentest/gentest.js

@@ -56,7 +56,7 @@ function printTest(e, ext, LTRContainer, RTLContainer, genericContainer) {
     ' */',
     ext === 'cpp' ? '\n// clang-format off' : '',
     '// @' +
-      'generated by gentest/gentest.rb from gentest/fixtures/' +
+      'generated by gentest/gentest-driver.ts from gentest/fixtures/' +
       document.title +
       '.html',
     '',