CacheMarkdownField.banzai_render_context forces project/group evaluation, even if it's never used
<!--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=589496) </details> <!--IssueSummary end--> See: https://gitlab.com/gitlab-org/gitlab/-/blob/61cf6a57c73cc514e7f2b172f2baac036ac698ff/app/models/concerns/cache_markdown_field.rb#L35-38 Evaluating these attributes can cause a few database trips — if the Markdown field is cached, depending on post-processing requirements, we may never actually refer to them. Ideally, Banzai render context fields would be evaluated lazily.
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