Implement span processor's OnEnding #14564

Job	Run time
lint	2m 7s
compatibility-test (1.23.0, ubuntu-latest, 386)	34s
compatibility-test (1.23.0, ubuntu-latest, amd64)	1m 10s
test-bench	53s
compatibility-test (1.23.0, macos-13, amd64)	2m 31s
compatibility-test (1.23.0, macos-latest, arm64)	41s
test-concurrent-safe	4m 4s
compatibility-test (1.23.0, windows-latest, 386)	2m 40s
compatibility-test (1.23.0, windows-latest, amd64)	1m 57s
compatibility-test (1.23.0, actuated-arm64-2cpu-8gb, arm64)	1m 49s
test-coverage	1m 2s
compatibility-test (~1.22.5, ubuntu-latest, 386)	26s
compatibility-test (~1.22.5, ubuntu-latest, amd64)	1m 7s
compatibility-test (~1.22.5, macos-13, amd64)	1m 11s
compatibility-test (~1.22.5, macos-latest, arm64)	1m 8s
compatibility-test (~1.22.5, windows-latest, 386)	1m 34s
compatibility-test (~1.22.5, windows-latest, amd64)	3m 1s
compatibility-test (~1.22.5, actuated-arm64-2cpu-8gb, arm64)	1m 49s
test-race	2m 8s
codecov	7s
test-compatibility	1s
	32m 0s

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