remove not needed server starts in tests #991

Job	Run time
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	10m 8s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	11m 26s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	6m 45s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	54s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	9m 41s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	8m 9s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	4m 34s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	5m 28s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	4m 16s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	8m 10s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	8m 48s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	6m 38s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	6m 29s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	8m 41s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	6m 50s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	7m 24s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	6m 35s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	7m 52s
static analysis (Elixir 1.15.x \| Erlang/OTP 25.x)	23s
	2h 9m 11s

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