When updating by rebase we need to set the environment for head repo #22535
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The update by rebase code reuses the merge code but shortcircuits and pushes back up to the head. However, it doesn't set the correct pushing environment - and just uses the same environment as the base repo. This leads to the push update failing and thence the PR becomes out-of-sync with the head.
This PR fixes this and adjusts the trace logging elsewhere to help make this clearer.
Fix #18802
Signed-off-by: Andrew Thornton [email protected]