dartdoc can't handle sky_engine containing SDK sources

[jcollins-g]

dartdoc doesn't generate good docs (see http://docs.flutter.io and missing 'empty' link, "sky_engine" library, etc) because it has lost track of where the Dart SDK is. This is likely related to a known issue in dartdoc (dart-lang/dartdoc#1367) where we don't obey analysis option files or the other hints that the analyzer uses to figure these things out.

I believe it is likely that this PR triggered the problem: flutter/engine#3575.

This interacts badly with the canonicalization improvements in dartdoc 0.10.0, because it now matters more to dartdoc that it can find the SDK. @sethladd @Hixie @devoncarew

[jcollins-g]

dart-lang/dartdoc#1385 addresses this

[github-actions]

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