Alrod/revert function name

[alrod]

Issue describing the changes in this PR

This PR reverts the commit: https://github.com/Azure/azure-functions-servicebus-extension/commit/cd7528ae4aab8ba90531a90e33e41b4e46cc4801

We do not need this change anymore as the ServiceBus SDK errors can be correlated with function name by details logged on listener start up.

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• [x] My changes should not be added to the release notes for the next release
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