Merge mono_pkg steps to avoid blocking tests with analyze issues #1328

Job	Run time
format_analyze_test; linux; Dart 2.19.0; PKG: protobuf; `dart analyze --fatal-infos`	21s
mono_repo self validate	14s
format_analyze_test; linux; Dart 2.19.0; PKG: protobuf; `dart test`	28s
format_analyze_test; linux; Dart 2.19.0; PKG: protoc_plugin; `./../tool/setup.sh`, `make protos`,...	38s
format_analyze_test; linux; Dart 2.19.0; PKG: protoc_plugin; `./../tool/setup.sh`, `make protos`,...	44s
format_analyze_test; linux; Dart dev; PKG: protobuf; `dart analyze --fatal-infos`	20s
format_analyze_test; linux; Dart dev; PKG: protobuf; `dart test`	22s
format_analyze_test; linux; Dart dev; PKG: protoc_plugin; `./../tool/setup.sh`, `make protos`, `d...	39s
format_analyze_test; linux; Dart dev; PKG: protoc_plugin; `dart format --output=none --set-exit-i...	30s
format_analyze_test; osx; Dart dev; PKG: protobuf; `dart test`	59s
format_analyze_test; osx; Dart 2.19.0; PKG: protobuf; `dart test`	1m 11s
format_analyze_test; windows; Dart 2.19.0; PKG: protobuf; `dart test`	39s
format_analyze_test; windows; Dart dev; PKG: protobuf; `dart test`	36s
format_analyze; linux; Dart dev; PKG: api_benchmark; `dart format --output=none --set-exit-if-cha...	30s
format_analyze; linux; Dart dev; PKG: benchmarks; `dart format --output=none --set-exit-if-change...	25s
	8m 36s

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