Investigate and fix explosions for shadowrealm tests in idlharness

[jcscottiii]

Background

This manifest PR failed to merge. It was because of this WPT PR. In that PR, it removed explicit shadowrealm test files and instead added metadata to the neighboring idlharness.any.js. However, when we go to manually fix the test reference like usual (example), it still fails saying that it can't find the test file.

From @KyleJu 's comment:

I believe that web-platform-tests/wpt#49342 introduced a new type of scope keywords, which is not the list of filename suffixes that wpt.fyi generates. It broke the manifest file generation.

In the meantime, we will remove the tests and keep this issue to investigate.

Definition of done

• Implement a solution that catches this case
• Revert this commit and add the tests back in with the corrected references.