unload mix project apps before loading config #1064

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 25.x)	21s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	5m 37s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	7m 18s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	7m 13s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	2m 18s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	1m 24s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	7m 18s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	1m 48s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	5m 29s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	8m 28s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	7m 40s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	3m 15s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	5m 31s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	6m 59s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	4m 17s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	6m 25s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	1m 32s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	6m 55s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	4m 4s
	1h 33m 52s

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