This commit syncs minor changes for the default theme from its active development repository to core.
This is a follow up to [52081], [52107], [52164], and [52222]. It includes changes to template part markup, theme.json appearance flags, navigation block markup, and text domains. For a full set of changes, visit 742df6cb2b...1a121e0224.
Props poena, kjellr, onemaggie, hellofromtonya.
See #54318.
Built from https://develop.svn.wordpress.org/trunk@52283
git-svn-id: http://core.svn.wordpress.org/trunk@51875 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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