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This PR completest the migration by removing `SemanticsUpdateBuilderNew` from the engine. This is mainly targeted at https://github.com/flutter/flutter/issues/17988 Steps: part 1: [engine] add `SemanticsUpdateBuilderNew` https://github.com/flutter/engine/pull/47961 part 2: [flutter] use `SemanticsUpdateBuilderNew` https://github.com/flutter/flutter/pull/138331 part 3: [engine] update `SemanticsUpdateBuilder` to be the same as `SemanticsUpdateBuilderNew` https://github.com/flutter/engine/pull/48882 part 4: [flutter] use (now updated) `SemanticsUpdateBuilder` again https://github.com/flutter/flutter/pull/139942 **part 5: [engine] remove `SemanticsBuilderNew`** <-- we are here