Test

Simplify gh21031.phpt and solve flakiness #1660

Job	Run time
Generate Matrix	8s
Suite / MACOS_ARM64_DEBUG_NTS	17m 0s
Suite / ALPINE_X64_ASAN_DEBUG_ZTS	28m 53s
Suite / LINUX_X64_RELEASE_NTS	25m 5s
Suite / LINUX_X64_ASAN_DEBUG_ZTS	45m 51s
Suite / LINUX_X32_DEBUG_ZTS	13m 28s
Suite / BENCHMARKING	16m 41s
Suite / WINDOWS_X64_ZTS	33m 41s
Suite / FREEBSD_NTS	11m 20s
Suite / COVERAGE	0s
Suite / PECL	0s
Suite / MSAN	0s
Suite / OPCACHE_VARIATION	0s
Suite / COMMUNITY_${{ matrix.type }}	0s
Suite / LIBMYSQLCLIENT	0s
Suite / LINUX_PPC64_ASAN_DEBUG_ZTS	0s
Suite / SOLARIS	0s
	3h 12m 7s

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