Tests: extract command output normalization to CommandOutputHelper class #130

Job	Run time
Test for mutants (ubuntu-latest, 8.1)	1m 25s
Coding standard (ubuntu-latest, 8.1)	30s
Static analysis (ubuntu-latest, 8.1)	24s
Tests (ubuntu-latest, 7.4, false)	22s
Tests (ubuntu-latest, 8.0, false)	35s
Tests (ubuntu-latest, 8.1, false)	28s
Tests (macos-latest, 7.4, false)	1m 31s
Tests (macos-latest, 8.0, false)	1m 13s
Tests (macos-latest, 8.1, false)	1m 13s
Tests (windows-latest, 7.4, false)	1m 7s
Tests (windows-latest, 8.0, false)	1m 7s
Tests (windows-latest, 8.1, false)	1m 14s
Tests (ubuntu-latest, 7.4, --prefer-lowest --prefer-stable, false)	36s
Tests (ubuntu-latest, 8.2, --ignore-platform-req=php+, false)	25s
Status check - CI	6s
Code coverage finish (ubuntu-latest, 8.1)	7s
	12m 23s

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