Prepare v3.27.0

Ensure if we reuse an old node, it's added back to the parent

Try to initialize Flutter if we don't otherwise find a Dart SDK throu…

…gh normal paths

Fixes Dart-Code#3580.

Fix Flutter logpoint test for SDK DAP

Prepare v3.26.0

Check whether Flutter SDK version matches the one in package files

Fixes Dart-Code#3540.

Prepare v3.25.1

Prepare v3.25.0

Switch protobuf back to master as null_safety was merged and deleted

Prepare v3.24.2