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When top-level await is enabled, all module script evaluation is
expected to return a Promise. This CL changes
ValueWrapperSyntheticModuleScripts (CSS and JSON) to return a Promise
that's resolved to undefined.

Bug: v8:1154497
Change-Id: I92114d42f0080918e9e61bf1b62d5eda4cffdabc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2568823
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Hiroshige Hayashizaki <hiroshige@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833790}