chore: remove azure pipelines (using GH actions) (#2711)

.github/workflows/nodejs.yml

@@ -9,7 +9,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [8.x, 10.x, 12.x]
+        node-version: [8.x, 10.x]
 
     steps:
     - uses: actions/checkout@v1

azure-pipelines.yml

@@ -1,27 +0,0 @@
-jobs:
-- job: ci
-  pool:
-    vmImage: 'Ubuntu-16.04'
-
-  strategy:
-    matrix:
-      node_8_x:
-        node_version: 8.x
-      node_10_x:
-        node_version: 10.x
-
-  steps:
-  - task: NodeTool@0
-    inputs:
-      versionSpec: $(node_version)
-
-  - script: |
-      apt-get update && apt-get install -y libgconf-2-4
-      node --version
-      npm --version
-      yarn --version
-      yarn
-      yarn bootstrap
-      yarn test:all:ci
-    env:
-      CYPRESS_RECORD_KEY: $(cypressRecordKey)