Fix scala_proto_library default outputs

[simuons]

Description

scala_proto_library returns too many outputs via DefaultInfo files

It returns all transitive jars used for compilation while it should return
pair of srcjar and compile jar for each direct proto_library dependency

Test standalone_scala_proto_outs_test failure before change:

In test _default_outputs_test from //test/proto:default_outputs_test.bzl: 
Expected "["standalone_proto_scalapb-src.jar", "standalone_proto_scalapb.jar"]", but got 
"["disruptor-3.4.2.jar", "fastparse_2.12-2.1.3.jar", "grpc-api-1.70.0.jar", "grpc-context-1.70.0.jar", "grpc-core-1.70.0.jar", "grpc-netty-1.70.0.jar", "grpc-protobuf-1.70.0.jar", "grpc-stub-1.70.0.jar", "guava-33.4.0-jre.jar", "instrumentation-api-0.3.0.jar", "lenses_2.12-0.11.17.jar", "libcore.jar", "liblite_runtime_only.jar", "netty-buffer-4.1.110.Final.jar", "netty-codec-4.1.110.Final.jar", "netty-codec-http-4.1.110.Final.jar", "netty-codec-http2-4.1.110.Final.jar", "netty-codec-socks-4.1.110.Final.jar", "netty-common-4.1.110.Final.jar", "netty-handler-4.1.110.Final.jar", "netty-handler-proxy-4.1.110.Final.jar", "netty-resolver-4.1.110.Final.jar", "netty-transport-4.1.110.Final.jar", "opencensus-api-0.22.1.jar", "opencensus-contrib-grpc-metrics-0.22.1.jar", "opencensus-impl-0.22.1.jar", "opencensus-impl-core-0.22.1.jar", "perfmark-api-0.27.0.jar", "scala-library-2.12.20.jar", "scala-reflect-2.12.20.jar", "scalapb-runtime-grpc_2.12-0.11.17.jar", "scalapb-runtime_2.12-0.11.17.jar", "standalone_proto_scalapb-src.jar", "standalone_proto_scalapb.jar"]"

Motivation

When downloading target outputs via result-store we get unrelated jars.