[actions] remove redundant finisher; use reusable workflow

Author: ljharb

.github/workflows/node-aught.yml

@@ -10,10 +10,3 @@ jobs:
       type: minors
       command: npm run tests-only
       skip-ls-check: false
-
-  node:
-    name: 'node < 10'
-    needs: [tests]
-    runs-on: ubuntu-latest
-    steps:
-      - run: 'echo tests completed'

.github/workflows/node-harmony.yml

@@ -9,10 +9,3 @@ jobs:
       range: '>=0.4 <16'
       type: minors
       command: npm run test:harmony
-
-  node:
-    name: 'node: harmony'
-    needs: [tests]
-    runs-on: ubuntu-latest
-    steps:
-      - run: 'echo tests completed'

.github/workflows/node-tens.yml

@@ -9,10 +9,3 @@ jobs:
       range: '>= 10'
       type: minors
       command: npm run tests-only
-
-  node:
-    name: 'node >= 10'
-    needs: [tests]
-    runs-on: ubuntu-latest
-    steps:
-      - run: 'echo tests completed'