feat: Introduce a `--diff=diffMode` option #750

Job	Run time
AutoReview Tests	11s
Lint CS	21s
Unit Tests (PHP 8.1, locked)	25s
Update the RequirementChecker	0s
Unit Tests (PHP 8.1, lowest)	29s
Unit Tests (PHP 8.1, highest)	19s
Unit Tests (PHP 8.2, highest)	20s
Wait for the PHAR & Docker images	10m 7s
Unit Tests (PHP 8.3, highest, --ignore-platform-req=php+)	50s
End-to-End Tests (_test_e2e_pass_no_config_min_composer_php, ghcr.io/box-project/box_php725)	18s
End-to-End Tests (_test_e2e_pass_no_config_min_box_php, ghcr.io/box-project/box_php81)	12s
End-to-End Tests (_test_e2e_pass_complete_min_composer_php, ghcr.io/box-project/box_php725)	15s
End-to-End Tests (_test_e2e_pass_complete_min_box_php, ghcr.io/box-project/box_php81)	12s
End-to-End Tests (_test_e2e_fail_complete_min_composer_php, ghcr.io/box-project/box_php725)	36s
End-to-End Tests (_test_e2e_fail_complete_min_box_php, ghcr.io/box-project/box_php81)	12s
End-to-End Tests (_test_e2e_skip_min_composer_php, ghcr.io/box-project/box_php725)	17s
End-to-End Tests (_test_e2e_pass_complete_requirement_checker_not_disabled, ghcr.io/box-project/b...	8s
End-to-End Tests (_test_e2e_fail_conflict, ghcr.io/box-project/box_php81)	12s
RequirementChecker status	1s
	15m 25s

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