Test

Simplify gh21031.phpt and solve flakiness #1572

Job	Run time
Generate Matrix	12s
Suite / FREEBSD_NTS	11m 29s
Suite / MACOS_ARM64_DEBUG_NTS	23m 30s
Suite / LINUX_X32_DEBUG_ZTS	12m 36s
Suite / ALPINE_X64_ASAN_DEBUG_ZTS	30m 45s
Suite / LINUX_X64_ASAN_DEBUG_ZTS	47m 7s
Suite / LINUX_X64_RELEASE_NTS	26m 38s
Suite / BENCHMARKING	21m 45s
Suite / WINDOWS_X64_ZTS	36m 40s
Suite / OPCACHE_VARIATION	0s
Suite / PECL	0s
Suite / SOLARIS	0s
Suite / COMMUNITY_${{ matrix.type }}	0s
Suite / LIBMYSQLCLIENT	0s
Suite / LINUX_PPC64_ASAN_DEBUG_ZTS	0s
Suite / COVERAGE	0s
Suite / MSAN	0s
	3h 30m 42s

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