Change return type of lifecycle hooks in `minitest` to be `void` #4273

Job	Run time
windows (windows-2019, ucrt)	50s
test (master-nightly-focal, test)	2m 22s
windows (windows-2019, mswin)	1m 4s
test (master-nightly-focal, stdlib_test)	2m 30s
windows (windows-2022, ucrt)	1m 30s
test (master-nightly-focal, rubocop validate test_doc build test_generate_stdlib)	2m 29s
windows (windows-2022, mswin)	1m 34s
test (master-nightly-focal, lexer confirm_lexer)	3m 30s
test (master-nightly-focal, lexer compile)	3m 36s
test (3.2-dev-focal, test)	2m 4s
test (3.2-dev-focal, rubocop validate test_doc build test_generate_stdlib)	2m 3s
test (3.2-dev-focal, lexer confirm_lexer)	3m 22s
test (3.2-dev-focal, lexer compile)	3m 27s
test (3.1-dev-focal, test)	2m 21s
test (3.1-dev-focal, rubocop validate test_doc build test_generate_stdlib)	2m 14s
test (3.1-dev-focal, lexer confirm_lexer)	3m 30s
test (3.1-dev-focal, lexer compile)	3m 27s
test (3.0-dev-focal, test)	2m 18s
test (3.0-dev-focal, rubocop validate test_doc build test_generate_stdlib)	2m 11s
test (3.0-dev-focal, lexer confirm_lexer)	3m 27s
test (3.0-dev-focal, lexer compile)	3m 25s
	53m 14s

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