test: split css minimizer tests into a separate file excluded by jest config

`it.skip`-ing the css-minimizer rows still left orphan snapshots in the
shared snapshot file, which made some CI rows fail when those snapshots
weren't reconciled. Move all of them into a dedicated
`test/css-minify-option.test.js` (with its own snapshot file) and add
a `testPathIgnorePatterns` entry in `jest.config.js` that drops that
file entirely on rows where the CSS deps don't run — Node <18 or
Windows. Removes the now-unneeded continue-on-error / fail-fast
overrides from the workflow.

Author: claude

.github/workflows/nodejs.yml

@@ -65,28 +65,13 @@ jobs:
     name: Test - ${{ matrix.os }} - Node v${{ matrix.node-version }}, Webpack ${{ matrix.webpack-version }}
 
     strategy:
-      fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
         node-version: [10.x, 12.x, 14.x, 16.x, 18.x, 20.x, 22.x, 24.x]
         webpack-version: [latest]
 
     runs-on: ${{ matrix.os }}
 
-    # The bundled CSS minimizers (`@swc/css`, `lightningcss`, `esbuild`,
-    # `cssnano@7`) require modern Node and don't reliably install on
-    # the Windows agents. Let the rows that exercise them run for
-    # visibility, but don't gate the workflow on them — only ubuntu
-    # and macOS at Node 18+ are required to pass.
-    continue-on-error: >-
-      ${{
-        matrix.os == 'windows-latest'
-        || matrix.node-version == '10.x'
-        || matrix.node-version == '12.x'
-        || matrix.node-version == '14.x'
-        || matrix.node-version == '16.x'
-      }}
-
     concurrency:
       group: test-${{ matrix.os }}-v${{ matrix.node-version }}-${{ matrix.webpack-version }}-${{ github.ref }}
       cancel-in-progress: true

jest.config.js

@@ -1,4 +1,15 @@
+// The bundled CSS minimizers (`cssnano@7`, `@swc/css`, `lightningcss`,
+// `esbuild@0.27`) require modern Node and don't reliably install on the
+// Windows agents. Skip the dedicated CSS test file outright on rows that
+// can't run them so we don't end up with stale or missing snapshots.
+const NODE_MAJOR = Number(process.versions.node.split(".")[0]);
+const IS_WINDOWS = process.platform === "win32";
+const RUN_CSS_TESTS = NODE_MAJOR >= 18 && !IS_WINDOWS;
+
 module.exports = {
   testEnvironment: "node",
   coveragePathIgnorePatterns: ["src/serialize-javascript.js"],
+  testPathIgnorePatterns: RUN_CSS_TESTS
+    ? []
+    : ["/test/css-minify-option\\.test\\.js$"],
 };