CI: add `diesel print-schema` check #26277

Job	Run time
Detect what files changed	44s
check-permissions / check-permissions	1s
build-build-tools-image / check-image	4s
build-build-tools-image / build-image	0s
build-build-tools-image / merge-images	0s
check-macos-build	0s
gather-rust-build-stats	0s
	49s

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