GetActionResultRequest: consider output_paths

The `GetActionResultRequest.inline_output_files` field must now contain
entries that are in the deprecated `Command.output_files` field or in
its replacement, `Command.output_paths`.

build/bazel/remote/execution/v2/remote_execution.proto

@@ -1311,7 +1311,8 @@ message GetActionResultRequest {
   bool inline_stderr = 4;
 
   // A hint to the server to inline the contents of the listed output files.
-  // Each path needs to exactly match one path in `output_files` in the
+  // Each path needs to exactly match one path in `output_paths` or
+  // `output_files` (DEPRECATED since v2.1) in the
   // [Command][build.bazel.remote.execution.v2.Command] message.
   repeated string inline_output_files = 5;
 }