fix: allow multiple SSRed Leptos apps on same server (closes #1806) (… #1419

Job	Run time
get-leptos-changed / Detect Source Change	6s
CI (integrations/actix) / Run ci (nightly)	13m 22s
CI (integrations/axum) / Run ci (nightly)	12m 56s
CI (integrations/utils) / Run ci (nightly)	12m 26s
CI (integrations/viz) / Run ci (nightly)	12m 42s
CI (leptos) / Run ci (nightly)	1h 31m 34s
CI (leptos_config) / Run ci (nightly)	12m 22s
CI (leptos_dom) / Run ci (nightly)	19m 31s
CI (leptos_hot_reload) / Run ci (nightly)	12m 7s
CI (leptos_macro) / Run ci (nightly)	17m 54s
CI (leptos_reactive) / Run ci (nightly)	39m 20s
CI (leptos_server) / Run ci (nightly)	19m 1s
CI (meta) / Run ci (nightly)	13m 11s
CI (router) / Run ci (nightly)	13m 51s
CI (server_fn) / Run ci (nightly)	13m 10s
CI (server_fn_macro) / Run ci (nightly)	12m 4s
CI (server_fn/server_fn_macro_default) / Run ci (nightly)	12m 23s
	5h 28m 0s

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