Add the experimental_use_cc_common_link flag for Rust

Upgrading to rules_rust 0.54.1 seems to have fixed some of our Rust linking
problems, but not all, so this change adds back in the
`--@rules_rust//rust/settings:experimental_use_cc_common_link=True` flag.

This fixes some local build errors like the following:
```
$ bazel build //rust/test/shared:bad_names_cpp_test

...

  = note: bazel-out/k8-fastbuild/bin/rust/test/shared/_ambiguous_libs/bad_names_cpp_test/libport-330124825.a(port.pic.o):port.cc:function google::protobuf::internal::CounterMap():(.text+0xe6): error: undefined reference to 'atexit'
```

PiperOrigin-RevId: 702380176

Author: acozzette

.bazelrc

@@ -3,6 +3,9 @@ build --cxxopt=-std=c++17 --host_cxxopt=-std=c++17
 # TODO: ErrorProne's SelfAssertions are violated in protobuf's test
 build --javacopt=-Xep:SelfAssertion:WARN
 
+# This flag works around some issues with Rust linking.
+build --@rules_rust//rust/settings:experimental_use_cc_common_link=True
+
 build:dbg --compilation_mode=dbg
 
 build:opt --compilation_mode=opt

.github/workflows/test_rust.yml

@@ -48,6 +48,6 @@ jobs:
           credentials: ${{ secrets.GAR_SERVICE_ACCOUNT }}
           bazel-cache: rust_linux
           bazel: >-
-            ${{ matrix.bazel_cmd }} --crosstool_top=//toolchain:clang_suite  --cxxopt=-std=c++17 --host_cxxopt=-std=c++17
+            ${{ matrix.bazel_cmd }} --crosstool_top=//toolchain:clang_suite  --cxxopt=-std=c++17 --host_cxxopt=-std=c++17 --@rules_rust//rust/settings:experimental_use_cc_common_link=True
             ${{ matrix.targets }} ${{ matrix.config.flags }}