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Stephan BehnkeandGitHub e2a5ab2e9b WorkflowIdConflictPolicy default on History (#5701)
## What changed?
<!-- Describe what has changed in this PR -->

Set default for `WorkflowIdConflictPolicy` in History as well.

## Why?
<!-- Tell your future self why have you made these changes -->

An issue can happen on downgrade where the Frontend is running a
previous version that doesn't set the default but the newer History
expects it.

## How did you test it?

Tested locally by commenting out the code in Frontend and History;
ensuring it fails and then re-enabling the code in History to verify it
fixes it.

## Potential risks

None; if there is a policy already, nothing happens.

## Documentation
<!-- Have you made sure this change doesn't falsify anything currently
stated in `docs/`? If significant
new behavior is added, have you described that in `docs/`? -->

## Is hotfix candidate?
<!-- Is this PR a hotfix candidate or does it require a notification to
be sent to the broader community? (Yes/No) -->
2024-04-10 20:54:40 +00:00
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