[pgAdmin4][Patch]: RM #3723 "Error while starting debugging listener" message displayed if user click on package(function) without body

Attached is the patch to modify the error message from "Error while starting debugging listener" to the actual message return by the database server. Issue is when we debug the package(function) without body, we got the error message "not executed, package body does not exist". Please refer "psql_error.png" file.

Solution: Instead of showing our own hard coded message, we should show the actual message comes from the database server.
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