Handler workflow reset callback carryover

[justinp-tt]

What changed?

Added special handling to prevent callback invocation during workflow reset and ensure it is only invoked once the reset workflow completes.

Why?

Reset implementation first terminates the workflow if it is running. For Nexus handler workflows, this causes the callback to be invoked with an operation terminated error.

How did you test it?

Functional test

Potential risks

Documentation

Is hotfix candidate?