[test] remove unused file (#38109)

Closes #38109

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/38109 from ctiller:💥💥💥 0e3a68cf8f
PiperOrigin-RevId: 696363624

test/core/test_util/one_corpus_entry_fuzzer.cc

@@ -1,39 +0,0 @@
-//
-//
-// Copyright 2016 gRPC authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-//
-
-#include <grpc/grpc.h>
-#include <stdbool.h>
-
-#include "absl/log/check.h"
-#include "src/core/lib/iomgr/exec_ctx.h"
-#include "src/core/util/crash.h"
-#include "test/core/test_util/tls_utils.h"
-
-extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size);
-
-extern bool squelch;
-extern bool leak_check;
-
-int main(int argc, char** argv) {
-  squelch = false;
-  leak_check = false;
-  CHECK_GT(argc, 1);  // Make sure that we have a filename argument
-  std::string buffer = grpc_core::testing::GetFileContents(argv[1]);
-  LLVMFuzzerTestOneInput(buffer.data(), buffer.size());
-  return 0;
-}