when in ESM mode, copy the the parent runtime CSS into the friendly iframe #30257
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This caused a major bug while we were experimenting with ads.
this would silently (because it is pre closure) remove the call for installStylesForDoc in src/friendly-iframe-embed.js which would then break ads because no styles are installed in the friendly iframe.
this was only triggered in the esm build because the "filter-imports" plugin was only turned on in the esm build.