[Bug]: report symlinks: false in webpack config

[alexeagle]

What happened?

If symlinks are disabled in

{
  "resolve": {
    "symlinks" false
  }
}

then webpack_bundle can't possibly resolve 3p dependencies. We could add a bazel 6 validation action that runs alongside the webpack_bundle so it's easier for users to discover the error.

Version

HEAD

[alexeagle]

Or we could add a jq action that modifies the config on the way in, like I've done in rules_angular