Vendor erlex, erl2ex, unload not needed apps #1039

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 25.x)	34s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	10m 11s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	5m 32s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	8m 38s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	6m 7s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	7m 37s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	4m 28s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	6m 3s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	4m 45s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	8m 50s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	6m 1s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	7m 51s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	4m 50s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	5m 41s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	4m 49s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	7m 14s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	5m 2s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	7m 19s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	3m 59s
	1h 55m 31s

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