[clang-format] exclude src/python/grpcio_observability/grpc_root (#35802)

Closes #35802

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/35802 from markdroth:clang_format_fix 39a6200f9a
PiperOrigin-RevId: 603954536

tools/dockerfile/grpc_clang_format/clang_format_all_the_things.sh

@@ -52,6 +52,7 @@ do
     -and -not -name grpc_tls_credentials_options_comparator_test.cc \
     -and -not -path '*/cmake/build/*' \
     -and -not -path '*/third_party/*' \
+    -and -not -path '*/src/python/grpcio_observability/grpc_root/*' \
     `"
   done
 done