implement SpanProcessor::onEnding #2950

Job	Run time
php (8.2, false)	39s
php (8.2, false)	1m 10s
php (8.2, false)	1m 15s
php (8.2, false)	59s
php (8.2, false)	58s
php (8.3, false)	48s
php (8.3, false)	52s
php (8.3, false)	46s
php (8.3, false)	46s
php (8.3, false)	46s
php (8.4, false, --ignore-platform-reqs)	34s
php (8.4, false, --ignore-platform-reqs)	1m 12s
php (8.4, false, --ignore-platform-reqs)	1m 18s
php (8.4, false, --ignore-platform-reqs)	1m 18s
php (8.4, false, --ignore-platform-reqs)	1m 18s
php (8.5, true, --ignore-platform-reqs)	1m 14s
php (8.5, true, --ignore-platform-reqs)	11m 42s
php (8.5, true, --ignore-platform-reqs)	1m 24s
php (8.5, true, --ignore-platform-reqs)	1m 24s
php (8.5, true, --ignore-platform-reqs)	1m 24s
packages	0s
packages	0s
packages	0s
packages	0s
packages	0s
	31m 47s

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