Integration tests for network interruptions and permission change

[deepesh1234]

Link to JIRA ticket - https://confluentinc.atlassian.net/browse/HCD-329

Added integration test using EmbeddedConnectCluster and Pumba for the following scenarios -

Elasticsearch Sink Connector

• End to End IT test (success scenario)
• IT test for Elasticsearch server unavailability
• IT test for network interruptions
• IT test for change in service credentials
• IT test for change in user permissions

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:x: fahadhasher
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