55499 fixed flutter pub get failure in tests (cla: yes, tool, waiting for tree to go green)

55500 Relands Fix FlutterError.onError in debug mode (cla: yes, framework, waiting for tree to go green)

55510 [flutter_tools] precache and unpack updates for desktop release artifacts (cla: yes, tool)

55513 [flutter_tools] Delete system temp entries on fatal signals (cla: yes, tool, waiting for tree to go green)

55521 Revert “Roll engine 8fff8da38da2..a544b45f26cc (3 commits)” (cla: yes, engine)

55522 Roll engine 8fff8da38da2..d2ec21221e29 (8 commits) (cla: yes, waiting for tree to go green)