[bazel] Fix lit tests with bazel 8.x (#119462)

llvm/llvm-project#83066

Author: keith

utils/bazel/.bazelrc

@@ -11,6 +11,9 @@
 # https://github.com/llvm/llvm-project/issues/55924
 common --enable_bzlmod=false --enable_workspace
 
+# TODO: Remove lit test reliance on this
+common --legacy_external_runfiles
+
 # Prevent invalid caching if input files are modified during a build.
 build --experimental_guard_against_concurrent_changes