Add commit message body as variable in custom changelog template
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=393191) </details> <!--IssueSummary end--> ### Release notes New variable "commit.message_body" for custom changelog templates ### Problem to solve The changelog generation function allows [custom templates](https://docs.gitlab.com/ee/user/project/changelogs.html#custom-templates). The currently available commit data fields are commit.title (as title), commit.reference, and commit.trailers. The main body of the commit message is not available. ### Proposal Please also support the **commit message body** (the lines between 'title' and 'commit.trailers' with leading and trailing blank lines stripped). Proposed variable name: commit.message_body ### Intended users Release Manager, Application Ops
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