Add missing feature_category to issuable_metric_image_spec.rb

changed milestone to %16.2

added backend groupcode review maintenanceworkflow labels

Reviewer roulette

Changes that require review have been detected!

Please refer to the table below for assigning reviewers and maintainers suggested by Danger in the specified category:

Category	Reviewer	Maintainer
backend	Aboobacker MK (`@tachyons-gitlab`) (UTC+5.5, 4.5 hours behind `@dskim_gitlab`)	Drew Cimino (`@drew`) (UTC+0, 10 hours behind `@dskim_gitlab`)

To spread load more evenly across eligible reviewers, Danger has picked a candidate for each review slot, based on their timezone. Feel free to override these selections if you think someone else would be better-suited or use the GitLab Review Workload Dashboard to find other available reviewers.

To read more on how to use the reviewer roulette, please take a look at the Engineering workflow and code review guidelines. Please consider assigning a reviewer or maintainer who is a domain expert in the area of the merge request.

Once you've decided who will review this merge request, assign them as a reviewer! Danger does not automatically notify them for you.

If needed, you can retry the danger-review job that generated this comment.

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