New VSCode fallback behaviour for copyToClipboard (#6598)  Adds a fallback behaviour for copying which will allow copy buttons to actually work in VSCode. NOTE: success toasts will no longer show in VSCode though. I've also added some logging just in case a user is looking at their console when a copy fails. Hopefully this provides enough information that the unhide-able error doesn't look suspicious.  Related to https://github.com/Dart-Code/Dart-Code/pull/4814 Fixes https://github.com/flutter/devtools/issues/5775 Mirror package:web version from Flutter SDK
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