feat: add user-configurable search score threshold slider for semantic search (#5027) #10008

Job	Run time
knip	40s
platform-unit-test (windows-latest)	5m 20s
platform-unit-test (ubuntu-latest)	2m 52s
compile	1m 52s
check-translations	31s
check-openrouter-api-key	4s
integration-test	8m 5s
notify-slack-on-failure	0s
	19m 24s

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