Test cases are needed to verify HttpResponseStatusFuture functionality

[chamil321]

Description:
Outbound response call is returning the status back to the user level. If the I/O operation failed, it returns the server connector error. Otherwise, the error is null. The notification is done using a response status future. Hence test cases are needed to verify the functionality in transport level.

Suggested Labels:
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Suggested Assignees:
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Affected Product Version:
ballerina 0.95 onwards versions

OS, DB, other environment details and versions:

Steps to reproduce:

Related Issues:
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