Issue Summary

When merging a pull request with merge queues, it does not respect the commit message which is provided while add the PR to the merge queue .  

Steps to Reproduce

1. Create a PR on a branch with merge queues configured. 
2. Change the commit message when Adding the PR to the merge queue to something other than the default message. 
3. The final commit message when the PR merges on the target branch is not the same as the one which was provided and the default commit message is retained "Merged in BRANCH (pull request #NNN) COMMIT MESSAGE Approved-by: APPROVER"

Expected Results

The commit message provided by the user must be retained 

Actual Results

The default message is retained instead of the one provided by the user. 

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available