chore: remove duplicate benchmarks in `leptos_reactive` #1194

Job	Run time
get-leptos-changed / Detect Source Change	9s
CI (integrations/axum) / Run ci (nightly)	58s
CI (integrations/actix) / Run ci (nightly)	1m 19s
CI (integrations/utils) / Run ci (nightly)	59s
CI (integrations/viz) / Run ci (nightly)	1m 1s
CI (leptos) / Run ci (nightly)	1m 1s
CI (leptos_config) / Run ci (nightly)	1m 6s
CI (leptos_dom) / Run ci (nightly)	56s
CI (leptos_hot_reload) / Run ci (nightly)	54s
CI (leptos_macro) / Run ci (nightly)	57s
CI (leptos_reactive) / Run ci (nightly)	51s
CI (leptos_server) / Run ci (nightly)	49s
CI (meta) / Run ci (nightly)	36s
CI (router) / Run ci (nightly)	45s
CI (server_fn) / Run ci (nightly)	25s
CI (server_fn/server_fn_macro_default) / Run ci (nightly)	1s
CI (server_fn_macro) / Run ci (nightly)	22s
	13m 9s

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