NIFI-7722 Enhance error-handling during request replication

[tpalfy]

https://issues.apache.org/jira/browse/NIFI-7722

Catching 'Throwable' instead of 'Exception' in 'NodeHttpRequest.run()' to make sure subsequent 'Object.notify()' (when request replication has completed) is not missed out even if an 'Error' is thrown.

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Enables X functionality; fixes bug NIFI-YYYY.

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[markap14]

Thanks @tpalfy , all looks good. +1 Merged to main