Fix `title_meta` handling in doc front matter#10879

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MisterFISHUP wants to merge 2 commits intofacebook:mainfrom MisterFISHUP:main

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Commits on Jan 29, 2025

fix: ensure title_meta in doc front matter is applied
MisterFISHUP
committed
test: correct prefix in validateBlogPostFrontMatter sidebar_label test
MisterFISHUP
committed