Update test generators to use tests.toml files #823
Description
PR #821 added tests.toml files for all exercises. We should update our test generator to only generate tests for the test cases that are in the tests.toml files and where the test is included (meaning its UUID is assigned true as its value).
The test generator should also remove the line at the top of generated test files that contains the versioning information (which is no longer present).
Depends on #822 being done first.