Increase coverage for dynamic import and top-level await #4421
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This PR includes two failing cases we found in JSC while running the import defer tests, for which we didn't have previous coverage. Given that dynamic import and top level await are features on their own, it's better to also have tests for it that do not use import defer.
What these tests are testing is that dynamic import of a module that is already rejected/pending returns a promise that is rejected/pending.