chore: Revert "chore: Switch Elixir tests back to pipes" #477

Job	Run time
Ruby Lint	23s
Ruby head - rack_1 - ubuntu-22.04 (optional)	11s
Ruby head - rack_2 - ubuntu-22.04 (optional)	15s
Ruby 2.7 - rack_1 - ubuntu-22.04	21s
Ruby head - rack_3 - ubuntu-22.04 (optional)	10s
Ruby 3.0 - rack_1 - ubuntu-22.04	11s
Ruby 3.1 - rack_1 - ubuntu-22.04	12s
Ruby 3.2 - rack_1 - ubuntu-22.04	17s
Ruby 3.3 - rack_1 - ubuntu-22.04	16s
Ruby 3.4 - rack_1 - ubuntu-22.04	9s
Ruby truffleruby - rack_1 - ubuntu-22.04	29s
Ruby 2.7 - rack_2 - ubuntu-22.04	27s
Ruby 3.0 - rack_2 - ubuntu-22.04	10s
Ruby 3.1 - rack_2 - ubuntu-22.04	10s
Ruby 3.2 - rack_2 - ubuntu-22.04	12s
Ruby 3.3 - rack_2 - ubuntu-22.04	15s
Ruby 3.4 - rack_2 - ubuntu-22.04	10s
Ruby truffleruby - rack_2 - ubuntu-22.04	30s
Ruby 2.7 - rack_3 - ubuntu-22.04	23s
Ruby 3.0 - rack_3 - ubuntu-22.04	14s
Ruby 3.1 - rack_3 - ubuntu-22.04	12s
Ruby 3.2 - rack_3 - ubuntu-22.04	17s
Ruby 3.3 - rack_3 - ubuntu-22.04	9s
Ruby 3.4 - rack_3 - ubuntu-22.04	10s
Ruby truffleruby - rack_3 - ubuntu-22.04	39s
	6m 52s

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