Configuring Remote Engine for the basic authentication with microservice build artifact

Configure the Remote Engine to authenticate with a microservice build artifact for secure access and metrics collection.

Configuring authentication allows the Remote Engine to securely access the microservice build artifact and collect metrics via the Jolokia endpoint.

Procedure

On the machine running the engine, set the following environment variables:
```
MS_SECURITY_USER_NAME
MS_SECURITY_USER_PASSWORD
```
They store the username and password for authentication.
For engine version v2.12.4 and newer, no additional setup is required as the engine is pre-configured to access the Jolokia endpoint.
For engine version earlier than v2.12.4, stop the engine, open the Engine_installation/etc/org.talend.ipaas.rt.dsrunner.metrics.collector.cfg file, and add the following lines.
```
ms.metric.collection.jolokia.username=${MS_SECURITY_USER_NAME:#{null}}
ms.metric.collection.jolokia.password=${MS_SECURITY_USER_PASSWORD:#{null}}
```

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