Remove optimized_snippet_search_query feature flag

Vasilii Iakliushinrequested to merge
562346-remove-ff into master

What does this MR do and why?

Contributes to #562346 (closed)

The optimized_snippet_search_query feature flag was used to safely roll out query optimizations for snippet search. The feature has been successfully enabled globally on production and is stable.

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Screenshot_2025-08-25_at_15.55.12

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Related to #562346 (closed)

Edited by Vasilii Iakliushin

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