Export GeneratedMessageGenericExtensions in generated files #1263

Job	Run time
mono_repo self validate	18s
format_analyze; linux; Dart 2.19.0; PKG: protobuf; `dart analyze lib`, `dart analyze test`	21s
format_analyze; linux; Dart dev; PKG: benchmarks; `dart format --output=none --set-exit-if-change...	26s
format_analyze; linux; Dart dev; PKG: protobuf; `dart format --output=none --set-exit-if-changed ...	19s
format_analyze; linux; Dart dev; PKG: protoc_plugin; `dart format --output=none --set-exit-if-cha...	32s
format_analyze; linux; Dart dev; PKG: api_benchmark; `dart format --output=none --set-exit-if-cha...	29s
run_tests; linux; Dart dev; PKG: protoc_plugin; `./../tool/setup.sh`, `make protos`, `dart test`	39s
run_tests; linux; Dart dev; PKG: protobuf; `dart test`	24s
run_tests; linux; Dart 2.19.0; PKG: protoc_plugin; `./../tool/setup.sh`, `make protos`, `dart test`	42s
run_tests; linux; Dart 2.19.0; PKG: protobuf; `dart test`	28s
run_tests; osx; Dart 2.19.0; PKG: protobuf; `dart test`	54s
run_tests; osx; Dart dev; PKG: protobuf; `dart test`	3m 30s
run_tests; windows; Dart 2.19.0; PKG: protobuf; `dart test`	42s
run_tests; windows; Dart dev; PKG: protobuf; `dart test`	54s
run_legacy_tests; linux; Dart 2.19.0; PKG: protoc_plugin; `./../tool/setup.sh`, `make protos`, `d...	30s
	11m 8s

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