Attempt to simplify the Android SDK interface ahead of refactoring it. The locateAndroidSdk static method is called at startup to locate the android SDK, returning null if it cannot be found. These helper methods attempted to first look up the AndroidSDK if it was already null - which could only cover the case where someone installed the Android SDK while flutter was running (possibly through an IDE)

Reland of acdb909f with fixes to semantics.dart

#61042

These tests look quite stable for the last 10 runs.

Bug:
  https://github.com/flutter/flutter/issues/64121

This reverts commit acdb909f.

Focus will be moved automatically if onEditingComplete is not specified, but must
by moved manually if onEditingComplete is specified.

This reverts commit 1de673bc.

Revert "Prevent viewport.showOnScreen from scrolling the viewport if the specified Rect is already visible.  (#56413)" (#64091)

This reverts commit 64d76f2f.

Also output covered | total lines, and a summary percentage at the end + Kick tree

This reverts commit 72619b86.