Enable workspace in .bazelrc

Ideally, all external deps should be moved to MODULE.bazel since from Bazel 8 WORKSPACE will be disabled.

Fixes https://github.com/protocolbuffers/protobuf/issues/18043

PiperOrigin-RevId: 674300277

.bazelrc

@@ -26,6 +26,7 @@ build:ubsan --copt=-fno-sanitize=function --copt=-fno-sanitize=vptr
 # TODO: migrate all dependencies from WORKSPACE to MODULE.bazel
 # https://github.com/protocolbuffers/protobuf/issues/14313
 common --noenable_bzlmod
+common --enable_workspace
 
 # Important: this flag ensures that we remain compliant with the C++ layering
 # check.