Fix Failed job about "image_html_options"

What does this MR do and why?

What

Failed job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/11853497

rake aborted!
NotImplementedError: Sidebars::Projects::Menus::ShimoMenu#image_html_options doesn't exist!

Why

Upstream 删掉了函数 image_html_options。看起来这个函数没什么用处，所以 JiHu 这里也直接删掉。

Upstream MR：https://gitlab.com/gitlab-org/gitlab/-/merge_requests/138956

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