* Revert "Add dashing config file for generating docset from flutter docs (#24374)"
This reverts commit ec8ca8606c9eec8b1ecc965f5045fd29130a7e16.
* Revert "Update driver script to execute test through test_core (#24168)"
This reverts commit 6c62cf337fb662684bb206e89018792eb68eb10a.
* Upgrade everything except matcher.
* Roll matcher (and test)
* Adjust tests that depend on flutter:test directly to depend on a shim
* Require use of package:test shim and remove other references to package:test