Fix failed pipeline 1115212 about "total_extra_pages"

What does this MR do and why?

Upstream deleted a method Projects:BlameService#total_extra_pages, JH here to update the new usage of the total_extra_pages.

Failed jobs:

• https://jihulab.com/gitlab-cn/gitlab/-/jobs/7308730
• https://jihulab.com/gitlab-cn/gitlab/-/jobs/7308726
• https://jihulab.com/gitlab-cn/gitlab/-/jobs/7308722
• https://jihulab.com/gitlab-cn/gitlab/-/jobs/7308708

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