Add issue(s) referenced by commit as template data in changelog generation

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Problem to solve

As a Gitlab user, I want the issues referenced by a commit be made available to changelog template data so I can include related issues to a release changelog.

The template data for the changelog generation endpoint (https://docs.gitlab.com/ee/api/repositories.html#template-data) includes many useful variables such as commit author or the MR that introduced the change, which are very helpful. But for some workflows it would be especially helpful to get the issues closed by that same commit so that it can be included in the changelog.

Proposal

Add a issue.reference variable to the template data for changelog generation.