Add reporter to deprecation/removal examples

What does this MR do and why?

The examples for deprecations and removals in this repo don't contain a reporter field that was present when this process used the www-gitlab-com project to house these announcement files. This field can be helpful when requesting a review or confirming the data at a later date.

Screenshots or screen recordings

These are strongly recommended to assist reviewers and reduce the time to merge your change.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.