Atomic workflow reset & update

Is your feature request related to a problem? Please describe.

• The use case is to reset the workflow to a previous point and immediately sends a update request to update the state.
• Currently, reset & update cannot be applied together. Update can happen milliseconds~second later after reset. There could be a race that when the code rely on the updated state after reset immediately, but the update request is not guaranteed to be applied atomically with reset, resulting in the reset-ed workflow execution continues with the "old" state.

Describe the solution you'd like
Provide a API, preferably something like ResetWithUpdate(...) to reset to a point of event with the update request fulfilled.

Describe alternatives you've considered
Using workflow.Await but the approach comes with extra flags to control the logic flow.

Additional context

• Slack source: https://temporalio.slack.com/archives/CTDTU3J4T/p1733236562254059

No files or tests are named. Start by tracing the existing workflow reset and update API entry points, then determine how their state transitions are coordinated. Done means a documented API provides reset and update semantics atomically and tests verify that the reset execution cannot continue with the old state.