Revert "Reland 2: Make LiveTestWidgetsFlutterBinding work with setSurfaceSize and live tests (#86912)" (#87233)

This reverts commit b50991d6.

This changes the "Waiting for another flutter command to release the startup lock..." message output so that it appears on stderr instead of stdout. When it appears on stdout, it can mess up collection of the output. For instance, if you run flutter --version --machine and you're expecting JSON output, then you'll get non-JSON output even though the lock is released and you eventually would get what you're asking for.

08c9b40d0 Expand camera platform interface to support pausing the camera preview. (flutter/plugins#4191) (#87161)

Fixes https://github.com/flutter/flutter/issues/87194

This reverts commit 863c42a8.

This reverts commit 5f792ba1.