Revert "Break down jenkins file steps"

This reverts commit 7e0c189070.

Jenkinsfile

     stage('Install npm packages') {
       steps {
       ansiColor('xterm') {
-        sh 'source ~/.bashrc'
+        sh '''#!/bin/bash -ex
+        source ~/.bashrc
+        npm install
+        npm run clean'''
         }
-        sh 'npm install'
-        sh 'npm run clean'
       }
     }
     stage('Run All Tests') {
       parallel {
         stage('Run test-js') {
           steps {
-            sh 'source ~/.bashrc'
-            sh 'npm run test-js'
+            sh '''#!/bin/bash
+            source ~/.bashrc
+            npm run test-js'''
           }
         }
         stage('Run IOS tests') {
           steps {
-            sh 'source ~/.bashrc'
-            ansiColor('xterm') {
-              sh 'npm run test-unit-ios -- --release'
-            }
-            sh 'npm run test-e2e-ios -- --release'
+            sh '''#!/bin/bash
+            source ~/.bashrc
+            npm run test-unit-ios -- --release
+            npm run test-e2e-ios -- --release'''
           }
         }
         stage('Run android tests') {
           steps {
-            sh 'source ~/.bashrc'
-            sh 'npm run test-unit-android -- --release'
-            sh 'npm run test-e2e-android -- --release'
+            sh '''#!/bin/bash
+            source ~/.bashrc
+            npm run test-unit-android -- --release
+            npm run test-e2e-android -- --release'''
           }
         }
       }