Explicitly disable bzlmod for rust_analyzer tests

It already isn't using bzlmod (the runner creates WORKSPACE.bazel),
making this explicit allows the tests to be run under bazel 8.

(Some work would be required to make test/3rdparty work with bazelmod,
I don't understand what.)

test/rust_analyzer/rust_analyzer_test_runner.sh

@@ -38,6 +38,9 @@ test_crate_repositories()
 EOF
 
     cat <<EOF >"${new_workspace}/.bazelrc"
+# TODO: support bzlmod
+common --noenable_bzlmod
+common --enable_workspace
 build --keep_going
 test --test_output=errors
 # The 'strict' config is used to ensure extra checks are run on the test