Don't collect everything after running a build

tools/internal_ci/linux/grpc_performance_profile_daily.cfg

@@ -19,7 +19,6 @@ build_file: "grpc/tools/internal_ci/linux/grpc_performance_profile_daily.sh"
 timeout_mins: 1440
 action {
   define_artifacts {
-    regex: "**"
     regex: "github/grpc/reports/**"
   }
 }

tools/internal_ci/linux/grpc_performance_profile_master.cfg

@@ -19,7 +19,6 @@ build_file: "grpc/tools/internal_ci/linux/grpc_performance_profile_master.sh"
 timeout_mins: 600
 action {
   define_artifacts {
-    regex: "**"
     regex: "github/grpc/reports/**"
   }
 }