Write used-jars.json for kotlin/java builds

Summary:
- used-classes.json files are used to remove unused dependencies from android/java/kotlin targets
- However, as [suggested](https://www.internalfb.com/diff/D66472678?dst_version_fbid=843546227744657&transaction_fbid=1102626487937834) by navidqar exposing them through providers isn't ideal because their format isn't guaranteed.
- As a solution this diff adds a new output to kotlincd_jar and javacd_jar actions - used-jars.json, which will then be exposed through Providers for further processing

Reviewed By: navidqar

Differential Revision: D68231809

fbshipit-source-id: c664bfc2c6ab3f72204858e1bd477869f968a051

prelude/java/javacd_jar_creator.bzl

@@ -309,13 +309,15 @@ def _define_javacd_action(
             elif compiling_deps_tset:
                 abi_to_abi_dir_map = compiling_deps_tset.project_as_args("abi_to_abi_dir")
         used_classes_json_outputs = [output_paths.jar_parent.project("used-classes.json")]
+        used_jars_json_output = output_paths.jar_parent.project("used-jars.json")
         args = setup_dep_files(
             actions,
             actions_identifier,
             args,
             post_build_params,
             classpath_jars_tag,
             used_classes_json_outputs,
+            used_jars_json_output,
             abi_to_abi_dir_map,
             hidden = hidden,
         )

prelude/jvm/cd_jar_creator_util.bzl

@@ -345,6 +345,7 @@ def setup_dep_files(
         post_build_params: dict,
         classpath_jars_tag: ArtifactTag,
         used_classes_json_outputs: list[Artifact],
+        used_jars_json_output: Artifact,
         abi_to_abi_dir_map: [TransitiveSetArgsProjection, list[cmd_args], None],
         hidden = ["artifact"]) -> cmd_args:
     dep_file = declare_prefixed_output(actions, actions_identifier, "dep_file.txt")
@@ -357,6 +358,7 @@ def setup_dep_files(
         for used_classes_json in used_classes_json_outputs
     ]
     post_build_params["depFile"] = classpath_jars_tag.tag_artifacts(dep_file.as_output())
+    post_build_params["usedJarsFile"] = used_jars_json_output.as_output()
 
     if abi_to_abi_dir_map:
         abi_to_abi_dir_map_file = declare_prefixed_output(actions, actions_identifier, "abi_to_abi_dir_map")

prelude/kotlin/kotlincd_jar_creator.bzl

@@ -463,13 +463,15 @@ def _define_kotlincd_action(
             output_paths.jar_parent.project("used-classes.json"),
             output_paths.jar_parent.project("kotlin-used-classes.json"),
         ]
+        used_jars_json_output = output_paths.jar_parent.project("used-jars.json")
         args = setup_dep_files(
             actions,
             actions_identifier,
             args,
             post_build_params,
             classpath_jars_tag,
             used_classes_json_outputs,
+            used_jars_json_output,
             compiling_deps_tset.project_as_args("abi_to_abi_dir") if kotlin_toolchain.dep_files == DepFiles("per_class") and compiling_deps_tset else None,
         )