Bug 37911: (follow-up) Use style-, css-loader to preserve compatiblity with Koha's Vue components, e.g. Dialog.vue

- For now let's not rely on rspack's native css loader to parse and
  bundle styles as we need to preserve compatibility.
- Reintroduce configuration block for style-, css-loader for islands.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>

rspack.config.js

@@ -82,7 +82,6 @@ module.exports = [
     },
     {
         experiments: {
-            css: true,
             outputModule: true,
         },
         entry: {
@@ -126,7 +125,12 @@ module.exports = [
                         path.resolve(__dirname, "t/cypress/"),
                     ],
                     type: "javascript/auto",
-                }
+                },
+                {
+                    test: /\.css$/i,
+                    type: "javascript/auto",
+                    use: ["style-loader", "css-loader"],
+                },
             ],
         },
         plugins: [