[Ballerina][MI] Overwrite message body is not working for generated MI connectors

[thuva9872]

Description

The overwrite message body option in the MI connectors that are generated from Bal connector is not working.

Steps to Reproduce

1.Generate a MI connector from Bal connector.
2. Add an operation to the MI API and select overwriteBody true.
3. Deploy and test it.

Version

0.4.3

Environment Details (with versions)

No response

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