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docs: Add CHANGELOG for 4.15.0 #650

Job	Run time
Check composer.json	11s
Analyse code	26s
Build and test (8.1)	31s
Build and test (8.2)	35s
Build and test (8.4)	33s
Build and test (8.1, --with=symfony/yaml:^6.4)	34s
Build and test (8.1, --with=symfony/yaml:^5.4)	36s
Build and test (8.5)	34s
Build and test (8.3)	40s
	4m 40s

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