Test reports are not being published to Azure Pipelines (#5715)

This PR is related to the issue #5713 
The PR helps to publish test results for reporting in Azure Pipelines.

Azure Pipelines provides excellent reporting capabilities that can be leveraged by this PR.
An example report is shown in the image below.
![image](https://user-images.githubusercontent.com/13175100/48767951-e8a73580-ecdd-11e8-8e6a-20d7767d7c1b.png)

azure-pipelines.yml

@@ -26,3 +26,15 @@ steps:
 - script: |
     yarn test
   displayName: 'Run tests'
+
+- task: PublishTestResults@2
+  displayName: 'Publish Test Results'
+  inputs:
+    testResultsFiles: '**junit*.xml'
+    testRunTitle: TestRun ${{ parameters.name }} $(node_version)
+
+- task: PublishCodeCoverageResults@1
+  displayName: 'Publish code coverage results'
+  inputs: 
+    codeCoverageTool: 'cobertura'
+    summaryFileLocation: '**/coverage/cobertura-coverage.xml'

jest.config.js

@@ -8,5 +8,6 @@ module.exports = {
   rootDir: 'test',
   modulePaths: ['<rootDir>/lib'],
   globalSetup: '<rootDir>/jest-global-setup.js',
-  globalTeardown: '<rootDir>/jest-global-teardown.js'
+  globalTeardown: '<rootDir>/jest-global-teardown.js',
+  coverageReporters: ['text', 'lcov', 'cobertura']
 }

package.json

@@ -9,7 +9,7 @@
     "bootstrap": "lerna bootstrap",
     "dev": "lerna run build --stream --parallel",
     "testonly": "jest",
-    "testall": "npm run testonly -- --coverage --forceExit --runInBand",
+    "testall": "npm run testonly -- --coverage --forceExit --runInBand --reporters=default --reporters=jest-junit",
     "pretest": "npm run lint",
     "test": "npm run testall || npm run testall",
     "coveralls": "cat ./test/coverage/lcov.info | coveralls",
@@ -52,6 +52,7 @@
     "fkill": "5.1.0",
     "flatten": "1.0.2",
     "get-port": "3.2.0",
+    "jest-junit": "^5.0.0",
     "jest-cli": "23.6.0",
     "lerna": "^3.4.0",
     "lint-staged": "4.2.3",