message: add m1 try bots
  Any Mac builder should be able to compile ARM64 builds when using target_cpu=arm64
  Cr-Commit-Position: refs/heads/main@{#35838}
diff: 'mac_dbg': 'debug_bot_x64',
  'mac_rel': 'release_bot_x64',
  'mac_asan': 'mac_asan_clang_release_bot_x64',
  + 'mac_rel_m1': 'release_bot_arm64',
  + 'mac_dbg_m1': 'debug_bot_arm64',
  # Linux
  'linux_compile_dbg': 'debug_bot_x64',
  