[Tests] run npm ls in tests

Author: ljharb

.github/workflows/node-4+.yml

@@ -78,7 +78,7 @@ jobs:
           node-version: ${{ matrix.node-version }}
           after_install: |
             npm install --no-save "eslint@${{ matrix.eslint }}" "@typescript-eslint/parser@${{ matrix.node-version >= 14 && '5' || (matrix.node-version >= 12 && '4' || (matrix.node-version >= 10 && '4.0' || (matrix.node-version >= 8 && '3' || '2'))) }}" "babel-eslint@${{ matrix.babel-eslint }}"
-          skip-ls-check: true
+          skip-ls-check: ${{ matrix.node-version < 10 && true || false }}
         env:
           NPM_CONFIG_LEGACY_PEER_DEPS: true
       - run: npm run unit-test

.github/workflows/node-pretest.yml

@@ -12,7 +12,6 @@ jobs:
         name: 'nvm install lts/* && npm install'
         with:
           node-version: 'lts/*'
-          skip-ls-check: true
         env:
           NPM_CONFIG_LEGACY_PEER_DEPS: true
       - run: npm run pretest
@@ -26,7 +25,6 @@ jobs:
         name: 'nvm install lts/* && npm install'
         with:
           node-version: 'lts/*'
-          skip-ls-check: true
         env:
           NPM_CONFIG_LEGACY_PEER_DEPS: true
       - run: echo 'legacy-peer-deps=true' >> .npmrc

.github/workflows/readme.yml

@@ -12,7 +12,6 @@ jobs:
         name: 'nvm install lts/* && npm install'
         with:
           node-version: 'lts/*'
-          skip-ls-check: true
         env:
           NPM_CONFIG_LEGACY_PEER_DEPS: true
       - run: npm run generate-list-of-rules:check