Add a test runner to two of the typescript tests to actually run them #3704
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This adds Jest as the test runner framework.
I have chosen this framework because it was the framework I managed to get running and because it seems reasonably popular:
https://2022.stateofjs.com/en-US/libraries/testing/
This uncovers that some of the tests are unrealistic code which would crash at runtime.
Before this PR, these tests were just compiled with tsc, but never run.
This PR also adds the new test script to the
crates/typescript-tests/run.sh
file which makes them run in the CI.