Support rendering text in backticks in a Markdown-*like* way, without employing either a full HTML or Markdown processor, to avoid mistakes of the past. This brings us a desired feature (and parity with e.g. GitHub) without opening ourselves up to the full range of mishaps we encountered with the previous approach. References: * https://gitlab.com/gitlab-org/gitlab/-/merge_requests/224839+ * https://gitlab.com/gitlab-org/gitlab/-/issues/587818+ (staff-only) * https://gitlab.com/gitlab-org/gitlab/-/work_items/476513#note_3336872646