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Add CHANGELOG.md modification check and warning comment #11361

Job	Run time
Multi-language repository (ubuntu-latest, stable-v2.21.4)	3m 39s
Multi-language repository (ubuntu-latest, stable-v2.19.4)	3m 40s
Multi-language repository (ubuntu-latest, stable-v2.20.7)	3m 37s
Multi-language repository (macos-latest-xlarge, stable-v2.23.9)	10m 13s
Multi-language repository (macos-latest-xlarge, stable-v2.24.3)	10m 3s
Multi-language repository (macos-15-xlarge, stable-v2.19.4)	6m 54s
Multi-language repository (ubuntu-latest, stable-v2.23.9)	3m 43s
Multi-language repository (ubuntu-latest, stable-v2.22.4)	3m 34s
Multi-language repository (macos-15-xlarge, stable-v2.20.7)	7m 45s
Multi-language repository (macos-15-xlarge, stable-v2.21.4)	7m 41s
Multi-language repository (ubuntu-latest, default)	3m 10s
Multi-language repository (ubuntu-latest, stable-v2.24.3)	3m 44s
Multi-language repository (macos-latest-xlarge, linked)	9m 59s
Multi-language repository (ubuntu-latest, linked)	2m 59s
Multi-language repository (macos-15-xlarge, stable-v2.22.4)	8m 17s
Multi-language repository (ubuntu-latest, nightly-latest)	3m 10s
Multi-language repository (macos-latest-xlarge, default)	11m 4s
Multi-language repository (macos-latest-xlarge, nightly-latest)	10m 20s
	1h 53m 32s