refactor serach index generator code (#15772)
* refactor: flatten search index * chore: use Function() to simplify parsing attribute * chore: remove comment handling * chore: simplify processing SearchLabel and SearchKeyword element * chore: use SearchLabel in mutedUsers * chore: small improvements * chore: remove a fallback path and simplify the entire code * fix: result path is not correct * chore: inline function
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