Add variable to support adding all commits to squash template
Problem to solve
When editing the squash commit message, the user should be able to have a review of the commit messages for the commits that will be squashed and be able edit them.
When squashing commits prior to merging, it can be helpful to include the details of all the commits that will be squashed so that users can understand the complete context of the change.
The format of the included commits should be:
* Commit title 1 Commit body 1 * Commit title 2 Commit body 2