ci (eslint-e2e): exclude nested node_modules from cache

This change removes the nested fixture node_modules from being cached, so that the symbolic link can be made after the build happens.

.github/workflows/runtime_eslint_plugin_e2e.yml

@@ -40,11 +40,11 @@ jobs:
         uses: actions/cache@v4
         id: node_modules
         with:
-          path: "**/node_modules"
+          path: "node_modules"
           key: runtime-eslint_e2e-node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
       - name: Ensure clean build directory
         run: rm -rf build
-      - run: yarn install --frozen-lockfile
+      - run: yarn install
       - name: Build plugin
         working-directory: fixtures/eslint-v${{ matrix.eslint_major }}
         run: node build.mjs