Diagnostics refactor #1120

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 25.x)	21s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	6m 14s
mix test (Elixir 1.12.x \| Erlang/OTP 22.x)	5m 23s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	6m 27s
mix test (Elixir 1.12.x \| Erlang/OTP 23.x)	5m 37s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	4m 47s
mix test (Elixir 1.12.x \| Erlang/OTP 24.x)	3m 50s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	5m 11s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	4m 15s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	6m 39s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	4m 42s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	5m 47s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	3m 15s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	4m 31s
mix test windows (Elixir 1.14.x \| Erlang/OTP 26.x)	4m 51s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	3m 4s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	4m 40s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	5m 18s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	3m 24s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	4m 40s
mix test windows (Elixir 1.15.x \| Erlang/OTP 26.x)	4m 57s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	3m 8s
mix test (Elixir 1.14.x \| Erlang/OTP 26.x)	3m 10s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	3m 23s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	3m 10s
mix test (Elixir 1.15.x \| Erlang/OTP 26.x)	3m 5s
	1h 53m 49s

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